Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f138e06504d2695…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 05:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a70b90ad2e4eb9959b14edbc20650c7a SHA-1: f574ad1ab1301940da3c18c65aecacd68ee562c2 SHA-256: 7f138e06504d2695c3d1f6ef2394807e080c2dfe4d5537d2520c6ed45cb706f9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it's used for phishing or distributing further malware. The PDF's structure and embedded links are designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=pmtct+guidelines+2016+pdf+nepal PDF link annotation
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2ieqovnn4tv501nrg9qvm552e6/lixixuxisisijuxufimur.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/vugitezije.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/78334083598.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be405fc933f---80153357033.pdfIn PDF document text
    • http://sakra.sk/storage/file/46794524542.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/limewu.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/lokinikila.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qfr07nubembet78o575l4t441r/lubomejimetuvixekibiviri.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/novulawolediwuturipep.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/musigetuzebinepajokuvad.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/2283952507.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a4cf9190b---makonewonugojurexigod.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/42316291456.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f51ab110---70616490648.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbbc6dcc0---javajonewu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aacb6c5834c---27085850580.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/labekovitimawipib.pdfIn PDF document text
    • https://soechi.com/userfiles/file/wuwinonelolilutesusi.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/71722929857.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/gimigofosak.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/78459231295.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715bc47c526---gisupuxomiluzoloz.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41134765785.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/80eb5f5a8d06f73fea65fe9b5e1d3018/votevetewibubimuruxidonu.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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 11304 bytes
SHA-256: 8e23bb496245bb820af9411e9cf378b4146d1918de4138f7115065f5cb4c5551
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 17624 bytes
SHA-256: 8c403c2f94afccc0103b34923c2db082dbd83be6f78a7ee75c962c5544e59768

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