Malicious PDF — malware analysis report

Static analysis result for SHA-256 9327f4f58f768b2a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 11:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56e34963e369a2974b36efa6407d658d SHA-1: a4883c5e7bbf36f2a107a9f1bf07cdaa69adf23f SHA-256: 9327f4f58f768b2a95d9ebbf0edd7fe3f3ef0dc662aaa7619e1cfba20d10e829
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure as a link farm is a common tactic for distributing malicious payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0afe33015da4c726b49a6d5d62e84b6/nesafariwobabazev.pdf In PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/moralej.pdfIn PDF document text
    • http://aven.su/userfiles/file/40641295075.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/62f4860c606173b4e99b742f86246648/bajuwebojor.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/buviloruda.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/be1e2cbf9b9de35b832ed8d41b4a01b6/35886344653.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/liwujoto.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/fonesutolurubaxuj.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f10e140b---26134219385.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909025677ed---gofudokifosudibozax.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8b5a4501---46148127639.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/87157011461.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/82551718896.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34acf9d199---61593603016.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094d01575067---53952860897.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/sanebawexinapebi.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/40220586494.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kcqhe8uiu7h09bd57cucg3o9kq/sozubulawenabinonisisa.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/8540791523.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3aocld1pbancclmbqojv42njjl/18730758187.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/damibono.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210623205245.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/71205718be5e9ddacf26c89eb5181078/69306618637.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098779b81618---65359789425.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/reboja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sap+course+full+details+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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 18052 bytes
SHA-256: 4c35ce863006ad1b6e709e4a2ea9b4ffe72bd8eb557b535f2cd9574ef014f2fc
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 10684 bytes
SHA-256: 690395a5d9b82a82d03e283cf37e10b088348a972e4a15da42997a656e60ff00