Malicious PDF — malware analysis report

Static analysis result for SHA-256 499d8c1bfdb9f12b…

MALICIOUS

PDF

80.2 KB Created: 2021-06-27 12:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c6b0d62f159a7dcfc8e18a2b5838f16 SHA-1: 2769121a17352c815677d6428e4a9db1a2791aeb SHA-256: 499d8c1bfdb9f12b25ded66ed1e6ba4d7e0e058bab5494999e924d39bc93bc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=another+word+for+proponents
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a89272d76---12193021761.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e55d54f911c54e6ea5468388b19b5cef/98473309757.pdf
    • http://arslanemlak.com/E/file/jomuretibawadele.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8cabd0b92f12268749a0021f586a552e/58633172697.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092930bca46c---pejalugudikexomepewum.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12389d386---51986314737.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/vboku4p8qg50ptj4m1bt7qotd1/bavofibomeragazalakixezov.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b61f7839d---kukifidixota.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/0c58922155ce832afe1fca0621c32118/7434790026.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/pogulelirakak.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bace9b98d1b---18836853369.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f4e8ceadb---vasopenazepowumojixodim.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/5c8156b893df0d6ec38cf6106e06dd10/5137154610.pdf
    • http://caratow.eu/userfiles/file/bibuxewubabuvetal.pdf
    • http://albino-pitti.com/pub_img/file/supowi.pdf
    • http://hotelsandmartin.cz/files/file/13751625929.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1723766f1---66994636612.pdf
    • https://papiratisk.cz/soubory/dutipiwop.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/fsc3f37ljiabdjfmj9de35bnl0/kenoxagonuzadoz.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/aae5f5b074aa1d0818f9b5e18094ef62/70097751669.pdf
    • https://digireg.nu/upload/kusodimomoronixuv.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fe7e3eb1d19e6b4fdd41748b66d9d2e1/xamuxap.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_off0000d4ce.bin
5ea687e4e6a86b9a37fe995838644d17dcea4b8a91939b724099101b833a1dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10364 bytes
font_01_sfnt_off0000ec3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 16792 bytes
font_02_sfnt_off00010450.bin
9dbf93583f3add9faa467cea01ba812a359a361e8da912a3b6fdbc32de75c8c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 18312 bytes