Malicious PDF — malware analysis report

Static analysis result for SHA-256 c591c558e4d94c9a…

MALICIOUS

PDF

80.7 KB Created: 2021-06-28 21:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1941d24ac8f9f0553f72f40d464ab381 SHA-1: 57e323ab0a4915c618cfe53d4e2ce2e189184e83 SHA-256: c591c558e4d94c9a08c91b9dbe52c7a4e618d32812bf93790821d901eb995838
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://arohitourandtravels.com/userfiles/file/gesebifad.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20210622224708.pdf
    • http://k-souz.com/userfiles/file/62930845824.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece6f14bcf---pujadorusago.pdf
    • http://biometria.pl/photos_fck/file/mudupofaxeratikiwidux.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/an4fm75i17pnk05hpdg9r25at2/guduxu.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/57231394766.pdf
    • https://anfauglir.com/images/file/68344146036.pdf
    • https://la-klamm.org/Files/files/89581670278.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ee061767bfc8b9cd8be4e6572f1396d4/vituxexeduzosaruloda.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad128ab070f---lorakojogiju.pdf
    • http://lideparts.com/userfiles/file/1620836960.pdf
    • https://appchecar.com/ckfinder/userfiles/files/6673575245.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/52jp05pfkk6jmkqhos3poudgt5/jejamow.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/75vu6jppq26uucbt27d3okblj3/xewesutefazu.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gvtkqfftu9uug7d18jb1l4hop5/53031622787.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb43ca367f0---temubemilozas.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160918b4a41d42---88113942046.pdf
    • http://mictrogiang.com/userfiles/files/8752933087.pdf
    • http://ajtoablakcentrum.com/_user/file/gewalukolux.pdf
    • https://edusfera.pl/upload/file/dopogozeva.pdf
    • http://daimarconstrucciones.com/images/admin/file/bosodabamonolosusumofe.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb3a124c3---61326722036.pdf
    • http://markasib.ru/ckfinder/userfiles/files/7937628625.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+rainy+day+poem+meaning
    • 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_off0000dac1.bin
5f631ceced404d099188415c5524dd840bb018f4d43e15796eaab312065ab0ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16804 bytes
font_01_sfnt_off000105c3.bin
28f4c42f8ffea8e8f803367a47cc0169d235807e2288e5f59e9939a772acd5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 10604 bytes
font_02_sfnt_off00011d8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 16792 bytes