Malicious PDF — malware analysis report

Static analysis result for SHA-256 d494b4f734adc4fd…

MALICIOUS

PDF

101.7 KB Created: 2021-07-01 14:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 677be42afdd108b0193e9562b6a9c5cd SHA-1: ec504bacd90a5d842c59c10a3788896d221a4b98 SHA-256: d494b4f734adc4fdd4b44c27a51c63fa6b1e1454ed5d08f3006676c94cda6278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, specifically targeting WordPress upload directories, which is a common tactic for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns suggest the PDF acts as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5468083e---livekifudijadalenesura.pdf In PDF document text
    • http://colescastle.com/clients/875019/File/68172914997.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/35475910184.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee104d5129---68850432856.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/be4nhnb2cspm5oa35j8nrrh8lk/tasajimonerexapefozop.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/57296147103.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/91082307875.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xememadofegefoxojo.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/05v0fq5u2up9ee88kimj47pci2/divopepulasezokebegap.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/68105749916.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0621efb3c1725703da3ae06d98f774be/41644705115.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/kugamilofizeju.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/66368894085.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e2b90016---taven.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d4d2ffe58035f7a806c5a91be2b98318/54626309279.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705a3cb0bb8---jemikaxitifadipesi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qf1gr74t5cvq2l0nn2jahgj414/52490514314.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/21238698320.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cece22138---30011188235.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/jp74l1jm4qmut32eiprsvh3q1h/62003851778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+self+confidencePDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 10176 bytes
SHA-256: 03f33860dcc924cc80829a20b4a41b719d0a3dfec4ff02ce348889a515f448d0
font_01_sfnt_off0001453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453E 17204 bytes
SHA-256: b0a17cce127e1d804bbce89dbd86381d599eb0e3879067c69f7431c672b1423f
font_02_sfnt_off000171f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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