Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ebbb5722c88399…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 12:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 642e2efac9de41d6d903db222bc7d026 SHA-1: f96abbe758dada022a4499ba5afcede6f82221a4 SHA-256: 06ebbb5722c883991e9318527f6ed57fb740807c578ff04712740e272e966661
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phishing lures. While no scripts were directly extracted, the nature of the URLs and the detection names imply a phishing or trojan distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075d58446a82---72998522681.pdf In PDF document text
    • https://santehsevast.ru/userfiles/files/dalibatoxiw.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/58942473447.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/texukaloleturumetativara.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210522205417.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/49274477753.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/30636860876.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/natajilujonilak.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/kazad.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/87199410801.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/00da8ed50195390bdefe851f271eb760/girovunoverusefabagavegis.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/vi4h6j81u654t596ko81d4r14n/patajedigusofuwapexogevi.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/sowax.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/709e80e6a24e1282806838791d19ac08/34684763637.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/sewibajokuxudegi.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/pofisef.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9ejitj3l21pcqel1fugq429c4g/zazowukizuj.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/paniwugedagevegedijanoset.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/904838c4cde3510e2ccb12c506dcc958/66651462573.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/4896004636.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2i03v93i88oq9rv2ihdroqijo9/63654703769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=delete+winsxs+folder+windows+7+manuallyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45d601e93---wojoziboxetalivuxu.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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 17680 bytes
SHA-256: 2ff8bd8a587f1cf02f9da4e43c4426e5b7d642949b4f1e52e7ba78c80724b083
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 10968 bytes
SHA-256: 9cefa823eb865fdc5ab415fa599596e093d94a8fe252fdd92e7dd50a64354e50
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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