Malicious PDF — malware analysis report

Static analysis result for SHA-256 83608750a4d03522…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 16:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9feab3cf03ae6b869f37218f1541f40 SHA-1: eb87867f35a8984c064021556362395d97f601dd SHA-256: 83608750a4d0352207340cfc3cc670b35856fc1e3c031bc8fcd50d5432f92af0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fd4c1043412f7e02260a60dbb7bc2447/dopafidopezamagazezoremur.pdf In PDF document text
    • https://cornwallstaffagency.com/userfiles/file/24636007490.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d0a186d0c8551c0698904266140120db/210298977.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/uetqafluoq3mqfi5ga3n4s969o/94450895559.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/rasomuponewexewuvuj.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5f748e8a---29915123594.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/zijewox.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210911052332.pdfIn PDF document text
    • https://okazionche.com/files/jugudulivejovomada.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139137b7209b---xutipijoli.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/tidoranalijisin.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/sevariwivurafonenob.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4784a111ed3f3bd74f05440598a22a5d/17803782170.pdfIn PDF document text
    • http://melabo.com/upload/files/93084211092.pdfIn PDF document text
    • https://korankertas.com/contents/files/tuvodup.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/64340533001.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/pizexugovozejolixitiwigis.pdfIn PDF document text
    • http://cga82.com/admin/File/77148944355.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/72084990301.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/68679561980.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/71422075700.pdfIn PDF document text
    • http://dentherapia.hu/files/file/molokojugemusep.pdfIn PDF document text
    • http://schokofontaene.de/idata/88093156007.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/38270829057.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/futipez.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/jepusij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=grow+old+with+you+songPDF 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_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 10572 bytes
SHA-256: c785dfd11307eb884a10f4675802e3abe23897a26fca6422257e18fe4e07db20
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 18144 bytes
SHA-256: 29202bb18f694d4d82672ae93b477d8061f670cbd455761c7cd4fe1e0a695a4e
font_02_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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