Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdc82b1e8d2b6ab…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 18:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d17326cd5804ca2337775fe3500a8ba SHA-1: b3f481e090c1a585a15bef7845cccc804ee02c91 SHA-256: dbdc82b1e8d2b6ab95f06b7ef14b4ce0a34864e4d2445c0f612d691d556833ba
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many links pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of external URIs and the nature of the heuristics strongly suggest this PDF is part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=suzuki+grand+vitara+2006+service+manual+pdf PDF link annotation
    • http://yalcinsezer.com/upload/ckfinder/files/70227186845.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e72e106d---sefowidimegozuv.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ccf1b600a---dofavaliwubibu.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/sogugirafujekavam.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/agga9gmbkavh6pg6ls235rj387/jodirixaxivafezedevir.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/zadabura.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b80507064---613536807.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8mjigv6042rn331btnum5r5af9/30916785718.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/52920799809.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc824cab0---51242276182.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/25864658853.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/luo06tmbn6j0kjo83nac1627i4/dexulu.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/93375125891.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d7f4af7b7558f8bfa3e07119b862410c/26190780460.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/76485381c5e52699ec90fb8124543c69/3191673105.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bc94d050b---pupolivetejelefaxowigodi.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/kunaralupunufisabaj.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/27604866282.pdfIn PDF document text
    • http://abnicum.com/files/file/jifuzogejap.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d53527d9d640d5538b0d4c58eb8b3df/90166645165.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee68cf98be7---lewelorigefas.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/23870311389.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/votojadofasoxow.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fewijipes.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8c80afdd4---8959238548.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e1e30210a686909ab5a590567cef9a0b/28046784759.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_off0000e56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 11648 bytes
SHA-256: 145543661b60b0325ce8b4b9d9577bde990e28190d4533810ffe7546d49311a7
font_01_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 16784 bytes
SHA-256: c080a0ea7217948e3d738699504f71718cceb8ca5dfc70d61c50e660f7c6b06b
font_02_sfnt_off00012cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.