Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a674cab61e4072…

MALICIOUS

PDF

85.1 KB Created: 2021-08-26 02:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cfc2e8437f3e1036312a9104aae9d194 SHA-1: 527777b2eb37d35d1a504880529f814701decd53 SHA-256: 52a674cab61e407231821aa209afa6b4aafbbce53f4e893e6c643ac189d1eb96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. Heuristics reveal it functions as a link farm, with numerous URLs pointing to disposable hosting or compromised CMS uploads, likely to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

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://krisoc.ru/uplcv?utm_term=the+parable+of+the+master+and+his+servant PDF link annotation
    • http://centreforeffectivecoaching.com/media/file/41625224352.pdfIn PDF document text
    • https://advik.net/userfiles/file/negaguwoj.pdfIn PDF document text
    • https://medius.sk/userfiles/file/xavopenageruk.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da14660c6f---rupuvomuwegelizatesofovi.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/xewibawaded.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/lexobugunuxozewumodojol.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf65ffd1084---tasizasosusopewogexomixo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/caejvaonj1rp3oqvjfvj8pkf7c/75056822811.pdfIn PDF document text
    • http://tfforming.ru/d/files/kupolopo.pdfIn PDF document text
    • http://handgun.ee/media/file/xesujokatojugawiz.pdfIn PDF document text
    • https://umartravel.com/files/gorimirusumalibekaru.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3df4cbe8b---24471550592.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/zexavisebujerigiweloribuj.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160e4533409---67731923404.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/60498196281.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0817e713a---begenerufuvivijokikizod.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc64a19f8d---faruwezuwilix.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160879ec320477---5183731079.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072030696b---46573060857.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24860590381.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b5449f7e---84297185723.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/fomopovepovozibe.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/baviwejozarufur.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/206a732bc0406857a6d87179677e1acb/vokexelelogizugafiv.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bfa945eff112ca6eb5f9f408154f6d9b/lupivofazorezubo.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_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 16948 bytes
SHA-256: 7c523b178a20eea7897b9c888c350ff740d70dadacfd053de75b6a733215d5b1
font_02_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 10932 bytes
SHA-256: 81927a6985bb7fde810024bb4cb6181896d38ed2c69187d0b4b43fa6591d9b92

Open this report in the interactive analyzer, or submit your own file for analysis.