Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a21778134ad17c…

MALICIOUS

PDF

93.7 KB Created: 2021-07-05 12:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5a823e15cd7258f4bef04323b8b1f6e2 SHA-1: 9fbeae495f2fff45f14904745949738e7207bafb SHA-256: 38a21778134ad17cbebc7e491718575f92b7baba60bf2f02ad0ab250c5f1de92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, which are likely used to host and distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, with the link farm pattern suggesting a phishing or malware delivery campaign. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://laborke.ru/uplcv?utm_term=how+to+convert+pdf+to+sheets PDF link annotation
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070749a249bb---89863292090.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/otixojexel.pdfIn PDF document text
    • http://ymmicro.com/files/files/24764186383.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd218b143---7551163297.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dffe17afd9de947ca17ca144a6862c58/75870394728.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/64cb7b6f592043c0bc2e95132995d48a/kolurigipigenajitimosudor.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7696a9926415ac9ccebad5989c649f32/30776383619.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f334249434f7f120c1d882c49407ccbd/wumawowotisenavodazune.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c303d96288d---41820934260.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea54ebb024---98049633857.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de3651c71---gojonexajobit.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/56625176837.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8854q2th61p6g31dol31eq24g8/zabavik.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/pafazezobebafukapopusi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc3988c3d---wanine.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/bewimivegofotawu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ea72c6f3964a9c3148193d961db63495/70351593576.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/jeruxifakeliduxosolola.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3672ca493a18d760298dd70a4274c478/71512825716.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/jekuputaburodajutisa.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/97831b72c17cf27854a305854bf7fa59/71434796487.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a46497c3c---paworexan.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/nezubej.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1ac90ae426476c116f8b68363d5e959f/76777464597.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 19008 bytes
SHA-256: dab9c41a90078394fb4fd61038b99b86c24eef069be4e9e3c68ccaae63ba0564
font_01_sfnt_off0001396f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396F 10560 bytes
SHA-256: d97bdd5289c534c3a5ce1e1cb9f6afdeb912e3dd89f08b662b3f053708395051
font_02_sfnt_off00015175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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