Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6abc1a97b56073d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-08 06:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6227801dc336ddae91c2b198b1b0454a SHA-1: 98a11ea9f5701098b87827ac64f011d0fa260891 SHA-256: e6abc1a97b56073df2c5a52d04cee9a49f24ba27047cd33c85b02b73b4b8df1e
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The presence of multiple external URIs and link farm heuristics confirms the primary function is to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=vedic+mathematics+pdf+in+bengali PDF link annotation
    • http://mp-hd.de/data/aktualnosci_imgs/file/86040666240.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/134301912160f6371eb5601.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f56ae6ba60ee3da375b86b6677010863/jimotutezipalila.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097e5a52aa4b---gabikedorulasa.pdfIn PDF document text
    • http://distributoram.com/files/file/63292024243.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/142868492afd049207f64ea8b4340900/mafosufatuvaguzukor.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/tesitogamiwusonepixu.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/71951259715.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/bojenuwujunizoxidot.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e7f56f5bc49f1963db8cb2acaf60ff67/1980810907.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b623ad19---12134104270.pdfIn PDF document text
    • http://immopolignano.lu/images/pogut.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/75dbv2gidij69qhkhqcvacr7m0/11516092336.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/rokut.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64dcb600b---76416313583.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/te38rohls11kav9dvh3vthoqmb/tubugokiretaripipu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e3326adb8c726bf1578661b954c3da09/20215483916.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/kawadokop.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/84658980881.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5f0f6de172c59c0e5dc5f70028e682be/gawom.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/vubumavumew.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dce1358efac---7581694800.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bc5pqn9ld07a2fao95dv1n8hsn/dovuzem.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/80e1f4eefeca07dbd4138d249a42b17a/gigobawu.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_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 18708 bytes
SHA-256: d9ef1d44c189f7d04e1849f46ac50e15b8a716615a77cace83b992b86702a4f8
font_02_sfnt_off00013fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA5 10956 bytes
SHA-256: 07bd7dd1d8de0d09bfad71829d42eb775f2dd962a1ffa2bef369f422d836eab1

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