Malicious PDF — malware analysis report

Static analysis result for SHA-256 5027dba60386591c…

MALICIOUS

PDF

104.7 KB Created: 2021-09-07 12:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8e38f4f1186ca9cd1b199ebfe3e0817 SHA-1: b2755c735bdcecaa6371bbd7deeaa96b4b3de0d9 SHA-256: 5027dba60386591c787c9b09c37927b185d237414e3a079d587b53b5369e2424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://archism.ru/uplcv?utm_term=haynes+manual+ford+fiesta+mk7 PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086e318ca15a---motemitadijezifi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/98785890386.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/rakaxewoluferusodixogugi.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/dijivurixazobad.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/badirulikinodorazajovatel.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/ritosufujuwadenejaniwe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e7885fc4625193b0dd9272e11420912/29464647353.pdfIn PDF document text
    • https://moolans.com/uploads/files/vijavagatenu.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/92371093097.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/13879870178.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/gotezagulu.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/69793501347.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/sokigoruzilofefo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/00489dd3be69c88ac862cc7158254fd0/88470681462.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/80400038646.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/82634442163.pdfIn PDF document text
    • http://healthywithhart.com/res/file/kopumikumuviv.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071154447fcf---84303409507.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9a33702cce18d95a823a53aa8ee7ae16/70163521485.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/8938092641.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/3214643598.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/90214179915.pdfIn PDF document text
    • http://orthodoxnews.us/file/75215841539.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_off00013256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13256 19160 bytes
SHA-256: b5c059b521dc9c21412e1b531faaf39f4f42aafd52b8a88ee6c11d18e71a3419
font_01_sfnt_off000163d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BEE 10860 bytes
SHA-256: 89e072fddf67550497ed06d5aea73f24a10f92c478a567a60c7e97f07f3118a5

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