Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac62fc86edc978f…

MALICIOUS

PDF

82.3 KB Created: 2021-08-16 15:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a0539b001fdb14eab2c2bddb165e009 SHA-1: 1243b9e7fe9e984c0aec6617f6d39104b69310aa SHA-256: aac62fc86edc978f7b17ec7a90ecc4740012566328c031f7a39acf8f0af60f3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms and compromised CMS uploads suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://citrasas.com/ckfinder/userfiles/files/boluxajuzib.pdf In PDF document text
    • http://angelescare.com/userfiles/file/tipinitopilebugobo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/878c28d6da2162b3f4b96863e1552fb8/gijugunugabemejef.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e7e0d221---68964586367.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/822c1d63fc0159fad1b68918b6a2d0d6/13661998836.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/68808797f14ed8f2c830057b372bbc9a/95136090807.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/24171285653.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba906aef1c---muwajokorimutaf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b1a583817b6431f18250e2e5ca8c03bb/87406674674.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3855debecb---38824974463.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/una0iquurukk2vb707gtmkbsbl/padulowojazetojiw.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sojutanixaso.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/jopokalowijakebu.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/98386218684.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8c9b2adfeaaeeee1aec15e4f62de825f/28895504156.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/54512a36bd0e96065e9f0100055182b3/wetubodilogigefaxeviz.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/nemad.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9dd4c8dc2---peziwa.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb03f4a2d11---9000108502.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/74892882885.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/lakoliw.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/nafera.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9a21r14djonlrci62fahn6qq6j/beviwexofagavowezaz.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/34243147731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+current+nc+notary+guidebookPDF 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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 17492 bytes
SHA-256: c35cb0a92ceb8ba8fdea3e103c2786d4c7b53a2036230a768fe9e519b8844cda
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 11040 bytes
SHA-256: 0585f98483488048d7acf74f57223f318f7e8c5de1d4be107084d44edf207e35