Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabc330d1f3ccf09…

MALICIOUS

PDF

69.3 KB Created: 2021-09-06 07:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 953f633691bc5e3c2ed05a1fde3b0736 SHA-1: 3fe1793ea736f113594d765105480cb3258c2a02 SHA-256: dabc330d1f3ccf09c4af08990d3251c9d4979908c1b39de76e3c814c9168c535
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. This suggests an attempt to leverage these sites for hosting malicious content or for SEO poisoning. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5777

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://www.abandassociates.com/ckfinder/userfiles/files/66745980798.pdf In PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/aa703f074811d896ca09f64a62303475/25837619222.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161129344ec3ab---gadigotasiw.pdfIn PDF document text
    • http://splogservice.ru/content/file/zulirazu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3d1550d4---45100320808.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/pudolevagixajimedel.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae5ab2682---falosotefapasaremej.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8a868f11b6f50384b9d4ecba5cfbc90e/1690648899.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5796181087---viwowifirepeluzekarivubow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918207640e1---nodupuban.pdfIn PDF document text
    • http://allycatering.com/userfiles/tafebitoroxexi.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/noxewuw.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b07af2e9443---relexasibowakut.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fabidusupi.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/mcti6pud1ufv2f5kb7vrfl7k4r/55376810961.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/c9ieu1l0omn0h12s8u6u3e7fkl/78893807781.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf07159cf---dizodonepegirobaxise.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/wasolumut.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/s51s4cg4fa2ccv5patic7jpuu6/83450434250.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/nazapesozaniwuzujoruva.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608154120b557---68583578518.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/31947012782.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/votovosilewuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=makalah+cmv+pdfPDF link annotation
    • 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_off0000b816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB816 10220 bytes
SHA-256: 1d443047a3ca57942d216e35d39565e19f56618dcc16343ac19d6571f083b610
font_01_sfnt_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 15820 bytes
SHA-256: e03779ec6ec85b476f4c828325df1a578711cdbe7f4e3a93b547ba35ea4d014d

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