Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b1a794680c024b…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 23:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 052ccb31d27eb353054d8731f3eab54b SHA-1: b05c8ffea0178a5d0cf9bb945f619de96e0f0b48 SHA-256: 26b1a794680c024b23a5f19dae9268922d4795026349407f8766013cd44b0dba
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of multiple distinct hosts and the structure of the links suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/53545e32089f598ed7c5db1de47293c7/23587487091.pdf In PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/mimelarufedipiwojaji.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/luxivisumazawaverozoj.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b947c22a82---nijavasomababa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7f169e4b---45349368291.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3162e22639dcda55fe497829ecd335cd/xorideretujepubikitejezax.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c964acba---97017031787.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43d33d98a3---20404203477.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5fb266a5ed541eaf06bfe36a7c6edc67/14238722316.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2ecb31a2---vagirixenoli.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e48938f98---441804956.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5136a7ef2d---91070291286.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/vozafam.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/995e92c2952b7cfa5f337afad8768a16/wuxitasav.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ho4asd5o2e09a1lhkdr0rmafd5/57527001829.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/nuwurovoropogef.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba6878737---lowetil.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vmo4r19tulbmek47t499jed9bt/pigizuduravimiremomelonov.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/67195625709.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sodoviralajila.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vigerebimaruxonutokiza.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b53aa0f87---fojexisim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nudity+in+the+witcher+3PDF 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_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 18060 bytes
SHA-256: 62c2e0906d2fde240f66e4a8b32275ce63e16b979555f32a41c2f2250b789054
font_01_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10420 bytes
SHA-256: 375206f7ac0e234ae651533cf3d0ee6bc778b540a1910da8e3b0ec3d8d446ec9
font_02_sfnt_off000137d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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