Malicious PDF — malware analysis report

Static analysis result for SHA-256 737013f82cda3fa9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 08:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9e83dadb603b5c17b024b81f5876b47 SHA-1: 62042f5ee221e334cde8f7f04e1365373551e707 SHA-256: 737013f82cda3fa9b34d2a76310756f762240c5e812aaef434fdf6c345814793
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_CALLBACK_LURE' indicates the document may prompt users to call a number in a deceptive context. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=exercicio+de+isomeria+plana+pdf PDF link annotation
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/np7agbv0p50trffjln4m71if2l/81865662852.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/13169132434.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/47129784171.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/xadopimojukagirumetabu.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/kinif.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608554186abea---kujogadazer.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9e80b15a341afe1d6f6c9ee4ffd04081/44952840703.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/jujowabe.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a229b31853f---futagepop.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c8972707e4097871c8141f18ddf35ade/botidu.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/kupumezajilo.pdfIn PDF document text
    • http://gewald.ru/content/Files/napasinezixesixexemaralo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bamotepuzorexutamor.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5cbc322a8bfe3c53101eadbd57c55d6a/11127781836.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/43859376625.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a075ff593ea---27446683971.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160aa93d5a0963---wegewag.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zudijokulo.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/84130898700.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/bofixivubekimevi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f3e0e71202bc989983412fa26e300148/fopozusisofixogojigonobu.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/jajumorumido.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/mapudexufixuv.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/pifiga.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/nadujisogat.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/14vhc39mn0gbp3msalbq83ugb3/newowan.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607abda7dde61---kibofipaxakusojiregifa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 10768 bytes
SHA-256: ba7427fc381147784d37f4b6e6493685b8dca2f944181d2e0f87935d375656ff
font_02_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 19160 bytes
SHA-256: d43e97767f542cd33968ff7b4af353280939a1e48bdd60ee750d7607f219e064

Open this report in the interactive analyzer, or submit your own file for analysis.