Malicious PDF — malware analysis report

Static analysis result for SHA-256 8993261786c89583…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 02:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37a25182d83d003632410b28811c54b0 SHA-1: 9b2a8f0aa1d815d0e247c47eaa8f8a29adfa1598 SHA-256: 8993261786c89583b7a72f67af7f5e7b69e5f8825deef3da7b8123faa91c575b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the 'link farm' heuristic indicate an attempt to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=best+wifi+file+transfer+app+for+android+to+pc PDF link annotation
    • https://bursac.net/userfiles/file/29600844770.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2031e3853752fdf81eec851e0cb4452e/temituber.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161392998e4f8b---towulifukatijowivige.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/kuperasujam.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/penawidanirezuz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/taduwopuzupon.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/sabilefogegala.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/77988879195.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/28713745544.pdfIn PDF document text
    • https://vitanov.rs/files/nirunolarazubijipokopub.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/77607611140.pdfIn PDF document text
    • http://clingac.es/d/files/1794905347.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/xalavewakigujozavo.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/bikexekagurubu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c86ab0ff88fab864887cb3fe60617385/verazufomonizo.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/gexafidilomawemiduzasewot.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/76999164551.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/86313319125.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/funosatipoj.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/lukazojukosajo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161329b42d32a2---xisiwate.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/xilux.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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 18160 bytes
SHA-256: 314a242d56d62cff08e6e067d911fd2c737dec14fe6671356b83e007ba44d5f7
font_02_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 10752 bytes
SHA-256: e686659ee93bbaae49c3488e0cfb2635ca8297cd80f9455d918fc058c8dadd06

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