Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaea687e798d90f…

MALICIOUS

PDF

83.2 KB Created: 2021-06-27 12:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad277f57813e6fb74530574ba0e6d8d5 SHA-1: a55ca464d38a6ed6209512cff1c6720769a18378 SHA-256: fcaea687e798d90f5d9a6bdbaa4abbbaba9bcccf90fdff5cccb593915a956a9a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to multiple compromised WordPress sites, likely to obscure the ultimate destination and evade detection. The presence of numerous PDF link farm indicators suggests an attempt to distribute malicious content or redirect users to phishing sites.

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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b39cff76d7e59d5275112eb9a67e9afe/mifusorurobok.pdf
    • http://studiogallerani.it/userfiles/files/87630276900.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cfa91c7c---9079553572.pdf
    • http://dzbnf.com/upload/file///vegulegikejowasuluwasit.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c538f168388---mutepapexozozug.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d0db1cf0b---tamupepepaterawexofopu.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/8329884ddff8511adff2cc94261716f0/mumipixufuwukanojolemubo.pdf
    • http://cwesp.biz/upload/file/xawuzusivuxazodam.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/91f68e6921f5359798449699853432da/kerunimewukegig.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6fe74de5---vajixajejanetarafitetilo.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/dowogojaxakuzas.pdf
    • https://thediamangroup.com/_images/files/54910350944.pdf
    • http://gancza.pl/userfiles/file/89103268265.pdf
    • https://ctapigroup3.com/contents//files/fuwudane.pdf
    • http://rolmech-strzelno.pl/Upload/file/tisofexewitusonul.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ed54ebaa---6431999604.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59ee4e59f---76168724471.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160abd41117df0---sixadolosaluvujiki.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c87a54728aa---bamukakitikofejewugemit.pdf
    • https://diarch.in/WYSIWYGImage/file/peduxotobetuferurajopo.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6880efcf4---tedonidezipepejev.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f9148e79cfde649ea72abf0ea13549e1/raxaji.pdf
    • https://akapacha.com/userfiles/file/93533662508.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/xuzodumerevewujumut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=save+as+pdf+extension+for+office+2007
    • 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_off0000e2a0.bin
e09c0e06283ed30799e63a5d3fe0de71fc5436320cfce947a9c3a2128d11efd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 16448 bytes
font_01_sfnt_off00010d2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 16792 bytes
font_02_sfnt_off00012542.bin
c4d156593d4877ed339280c0aa815022814fe9aeba5a55363455a554fcf49be1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 11104 bytes