Malicious PDF — malware analysis report

Static analysis result for SHA-256 624e3cccf0099a60…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 06:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39a4ecc32dabc6f348db221033dd0c70 SHA-1: 4961f2ba9171bdcb5952172b57d58341bcd8eca9 SHA-256: 624e3cccf0099a60e1cd275e4d2c6e0aa376a15040bb411d05bf282fb2d95f1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of urgency language further supports a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://faktxeber.ru/resimler/files/26720072465.pdf In PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/31644473399.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/zeniwixizivene.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/13969142370.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/6311067010.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3067_20210726144749.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/48510001151.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/nae6smno1l3ebd0sfqviki0uga/59347837634.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07266631b7722a270686c146d2c8243a/tunurunimatido.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0cd4ae04f088ec648bc8ea67ccd37074/dokaxexabivunuzodiwufewur.pdfIn PDF document text
    • http://iltorg.ru/upload/file/59039657552.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/97638545019.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/82694729908.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7nnf6uq2nnm25h722qvr0rn4l2/labix.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210521225157_g7mkxl.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4eb6e8128f827c73c2328ae5f7fa9c90/kaburalupamofit.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/23651250102.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/golasu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b88774e25---46512919724.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf5d2235d---geruraxu.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/50328136426.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2vma3o8rig4af4vft7ulu6sus9/ropug.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/bafuvigaj.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f50657b48139d512aacadc8817e127e3/negoxinivuvawipite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=magnetic+resonance+angiography+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80D 17076 bytes
SHA-256: 3fe385bb91c67a597cc0f9718e47aad3d708d0cac9cc09a3bd8d0f51a5ad96ce
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 10960 bytes
SHA-256: 74f4a9a72d2bd28bd736532e7676ce312fc6a4855de97845a4ff846fd2121582
font_02_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1