Malicious PDF — malware analysis report

Static analysis result for SHA-256 932f0a5fc62af0d0…

MALICIOUS

PDF

95.7 KB Created: 2021-08-07 10:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 19789e03051f80d5d7cbbb841a0f749f SHA-1: a52a39870e7098bf3332983fa233023cf22d78e4 SHA-256: 932f0a5fc62af0d08ce58ed2cb2c01addcdc1579c9e96c85a1d5a0b34f565d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://mabifitness.it/userfiles/files/83633634501.pdf In PDF document text
    • https://cytairtool.com/test/userfiles/file/20210807_0e511.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160960444cce3a---67239791676.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/msrltff0i8497946aei03cmq1f/47598009475.pdfIn PDF document text
    • http://rld-carbon.ru/file/dibulabodoxedezupo.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/73055858981.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/8m6efkanhu4egk04sgqas2bn30/61316365959.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160856c21d465e---kuzonozivonozaboniwokajok.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/88af1e48ee6643a09ded4a538ef79628/63174328034.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805064460a1---gajufadadolidi.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/gunixovepazebuxobi.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/maliti.pdfIn PDF document text
    • http://reflita.lt/uploads/files/21643650574.pdfIn PDF document text
    • https://argumentua.com/i/file/nifowibisewamugef.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/032305508394.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ceef0172---86739063058.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/91850875450.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210623114902.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/kativ.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/talovaneneforazimusopir.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210617194532_envnna.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zodif.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/41686187c63b9d86fc8a6ccf70a99231/51353404380.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/49036656284.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/65389281077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=which+of+the+following+is+a+permanent+accountPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 11108 bytes
SHA-256: c072d49debc7f1707b440ada901f0b515d2180a2274a27d00159ba666c4d526e
font_01_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 16416 bytes
SHA-256: a8d1e34bf444334761db8dd673e30599a677bf9ec537d4b136fd145dfe542046
font_02_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001411c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411C 17448 bytes
SHA-256: 0100d929f5d9f9a4058ac09a8644badb2c0f615a757903c286910fb36ec5b335

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