Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b65dbaa9d8c0901…

MALICIOUS

PDF

86.9 KB Created: 2021-07-14 00:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5423ae73c62a11329dbd5307412d545c SHA-1: c3afb21c39e410d7f916c9259181ed5c113ce78a SHA-256: 5b65dbaa9d8c090194b1e36e3829952bee5971ae1938ce344d75ca0dc42ab582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=living+as+cheaply+as+possible PDF link annotation
    • https://footballsod.com/images/ck-uploads/files/85501602438.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d45d07641cf---durafaxemofoz.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/c6ac3dab3f33b1e51b153fd07974a1b5/seduxegifotuluworebewemo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d689603dcf3---padubel.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e21f2b5a3---nevezazi.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/74477372653.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/67010454854.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/18110153761.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tmn9prh3sevblfc1m87qpih0qq/66292587557.pdfIn PDF document text
    • https://kultmotor.hu/images/files/40324811582.pdfIn PDF document text
    • http://ailizia.com/userfiles/rugomoxadoreriwepabefeja.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/75747716299.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/0ektnsqc7ie9t62pj7l1vntpqt/dovikarifapupaxebe.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9731eaba---rejesukujuzax.pdfIn PDF document text
    • https://faceless.me/userfiles/files/11069637396.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/lajifanekexelugiruju.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/009sits60r6ir9gijgnj2sbig5/sowode.pdfIn PDF document text
    • https://defaico.com/d/files/rijevelutijedujupirifevu.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/44067456485.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c3df7b0f2ed81c048851f8a4f6263b74/77459966660.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/duzinivageniwifirego.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lenufepegipupowobod.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b965cd98b002707d0b2e994556645be1/liraguzolotesana.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/dekugewebisa.pdfIn PDF document text
    • 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_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 10732 bytes
SHA-256: 37186b34b2ca33fea7098fcfa286378371e0af5598e76a79b7efe46f2cb97cae
font_01_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 17420 bytes
SHA-256: d35e6848e9c2698f589b472dbb113e01fffa762ca5aa0319532b3a4cbd064db8