Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bd737a4fbedac4…

MALICIOUS

PDF

93.1 KB Created: 2021-09-05 01:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c8f19604ac711338332ddc7c7f6dc6e SHA-1: e681c176b392832c64904930cd1356b6974ea29d SHA-256: 55bd737a4fbedac44ce4a99430a97617dedb5a853c5fdcdd2c0dc62f1d118c41
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the presence of many external links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd6c7e8966---95682212160.pdf In PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/49412473896.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/pekufewofi.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/gonovumoxenag.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/3279501436.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/91050146038.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xuzumodavesusenetewuzod.pdfIn PDF document text
    • http://raczcsalad.hu/files/lelotujuzivimu.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gulolipolezibu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/44c9b817b56b426cd9d1188903dc60ca/jedesimum.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/33efnkm24o1nnct70g97repgi0/badofupukosavalanaduwe.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///49072782255.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/41248188589.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/29047274395.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/foselifubefulevo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v5njjk34kab9qpc1thcdm344ch/58957505146.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/fiwomuf.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/47144495539.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4e09c692---wagaxamemewiwifavi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6evo3mpm0cp06qlmulpkp00si2/juruseratuwose.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af95791ec42---rinegiju.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1382dd09cd01868f2320197256ef2d49/13127753466.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/42054354455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=earthing+clint+ober+pdfPDF 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_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10856 bytes
SHA-256: 3f9cbc0b9866fe56508a73161d71447c494b2c1196118c90c13e9bc73f34fc44
font_01_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B7 17652 bytes
SHA-256: 228ba89b5382b1d6fb2ef1dbb9f61880b51b5de8423da73d365b9c1c93d9ad72

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