Malicious PDF — malware analysis report

Static analysis result for SHA-256 384f4420145a2e8f…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 06:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28d692df62cd851373e9e4c0f6a0d409 SHA-1: b024a2660069d605edfc5a4c9f16a178a2808216 SHA-256: 384f4420145a2e8fe1fec6545100428b70a4b1ee4db63387b95a596a40e7a38c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=regents+physics+reference+table
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8bcdec83651bb1e0ecfd047602c57720/pugakumulemuruni.pdf
    • https://gadd-asso.org/userfiles/file/22957299093.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da196594d1---xefonuri.pdf
    • https://hanahana.vn/media/ftp/file/15002718953.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e68f422da---rukimeluxerixag.pdf
    • http://motacademy.it/file/82457201923.pdf
    • https://kede.org/userfiles/file/75568415922.pdf
    • http://www.aadhar-interior.com/userfiles/file/15809985765.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fc1a761a9f6b0204b8d4f5f0e72a177b/44508278659.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/dizikez.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/5c36ebfeda8cdde942c7134414175c9b/jelukixu.pdf
    • https://termofriz.rs//files/49648140229.pdf
    • http://abacusnancy.com/userfiles/file/tuxutusomafofiverakajijiw.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0bc11816cd41ba824317741d6f6b346c/dasanizima.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086189ba96---68202974256.pdf
    • http://wagnerfamilyreunion.com/clients/866685/File/38696106554.pdf
    • http://www.sport-konyv.hu/userfiles/file/nerumabu.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/jobix.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758594f0f60---rekusodaritavekejifivovo.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077904e9895e---52946116851.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/c3fe105feea252e4fc05e2165937e5ef/75273689298.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jsar68uhlc193dd6h01b04bf41/74312251985.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 16792 bytes
font_01_sfnt_off0000f438.bin
7976135476b53b70dfc7cecf2077fb3d64467498def5ee33da3398a8cc753b98
pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10940 bytes
font_02_sfnt_off00010d4b.bin
d04bbab6cc276bc3b9356b0ad82f4d4dc4b64ac79d05654fc2dc676da523b4fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 19228 bytes