Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58f9f85046ca5c2…

MALICIOUS

PDF

84.6 KB Created: 2021-07-23 04:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f0faeb1194a70a1211d133c449319062 SHA-1: 1d5d445524b5f244d965182c1f7c1f1fbdd2fece SHA-256: c58f9f85046ca5c271a0f118359f363c248c386372abee16bf7d1ca2aec05d63
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads. The ML classifier and ClamAV also strongly indicated maliciousness, with ClamAV identifying it as a phishing trojan. The document's purpose appears to be to lure users to these compromised sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cf806776---xiwarojawixefaximulakug.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fe5a883e326684b7aca9e9ab1ee4c9ca/14074081826.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/53241912406.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/jamesopafixixedeniki.pdfIn PDF document text
    • http://palami.by/images/file/difamilas.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/kupokarojipabivizojogitir.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/87bne9a2483sbqsnrr2497h790/gubijan.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/muvobariwubamu.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/bobazefi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5644915d4f5d7309550a31ebfc13af13/94895655441.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/42390323850.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9e6f089f7b44929b3feb95fb4b110558/simadogi.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/bonarasojomakuposinusox.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/90cf87318f83f7d841b91ef8579307ff/68709510780.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/wezawivotuferoxe.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/53480600570.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/botabufagodamafutaf.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c05540cc127---36242068603.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/15hrsvkqa127f5kap902apnuoh/zuluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tax+arbitration+meaningPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d822e43a57734f0aa25694eb377f9d79/69857524867.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_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 16712 bytes
SHA-256: b07af12349c1b8f96e43d276040e2ea6858b467f50524c153400a1e25e89b998
font_01_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 10444 bytes
SHA-256: b1cc1b76415f56c92cb9c62965c20f73a01ba33db6076a7171008722b6d0fa16

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