Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfea968aad395dbe…

MALICIOUS

PDF

74.8 KB Created: 2021-09-23 01:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33a2dcbf8a6393f5a98e52ef7d7b49ab SHA-1: 0d3b6427222bbfe2f390d76d30754302ee33870d SHA-256: cfea968aad395dbeadfd98d885b8aba59ff19366c672ab3556c088732781e858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=rich+edittext+android PDF link annotation
    • http://www.jobsincrete.gr/images/_user_na/file/fugeleguzur.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/vavawovumuva.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/50401475301.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/98696234520.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/76082875377.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109221626395353.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/95736963909.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/91214714330.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/vupup.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/16967691840.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143151c01011---kuxuxumisur.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/06a9cc3df9c42494d3cd46e05a5bb716/8148914467.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/82668250558.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/62769781317.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/tetubutagagazalaxel.pdfIn PDF document text
    • http://shopabrang.com/images/files/31162411143.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/64139600894.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/pirarajopikamogomaw.pdfIn PDF document text
    • http://samtekelektrik.com/files/830223170.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371f5046396---wutisatomebuxaperira.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/26016215903.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/35904951893.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/6387623813.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0277064883a7431c569ec7036ed419da/84384483159.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_off0000bee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE9 18120 bytes
SHA-256: a3451bc868a177291ecbb4db5173205d540003d89e63986bf334fbade89c2553
font_01_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 10400 bytes
SHA-256: e809b4d64b239289e546127bd4fe3c95023468c73a23bb4cee274a1aa327951e
font_02_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1