Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af340efa261075a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 18:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3da0b7d7f262f2097045e8ca0a5dae6d SHA-1: 4b5d24044c66b59608e8e7a4d6413d1ed826d822 SHA-256: 6af340efa261075acc28d1fc4fa0a4af7e8e89c9ff7434cb77bdd58c7ef20670
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised WordPress installations, suggesting an attempt to host malicious content or redirect users. The primary attack pattern involves luring users through a malicious attachment to access these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16115605b4d710---luvalulaxalapojinasimag.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded81006c10---mijudusimudamibinepogu.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/87436667001.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/32034401346.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/jetexujuxarerexupawoxupuf.pdfIn PDF document text
    • http://ktcz.eu/files/files/kapaxifanusupopikozimibax.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/48328205074.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/jakovovowiv.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/04/gojasaje.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1810e660e6---4721411402.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/4825268961.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac2820048---kopavupixuzomuxu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/33898785851.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/23f1837b747fa61d1972a96c7d5694a8/37769846620.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/4591330555.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073f90ede6a4---boxesepijijufo.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/47054072961.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/wudufodapowitixuwivuvoke.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a0f8543f0---62649773438.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/tudimutemewibogegud.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/nujexux.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c62aa622830---vozuwuzajiterasede.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5a75722a9b3396ef2509fbde9ce5aad5/tasosipenaxu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n49vresqj0ajdagqal2bm041a3/givuwopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=suhr+badger+30+user+manualPDF 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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 10992 bytes
SHA-256: d89504162397d83968828254ad63605429a6891f18ec2eec1bdca93950ea3144