Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9d6a4585664798…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 03:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d154bed339ae14fe9239c7e35cc9c70 SHA-1: a6787d58f11e159719ad13d5f3b7997d35754e3b SHA-256: 2f9d6a4585664798a48bb8b1f4ddb2019319d9eba199254bd48874bb00c600a7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/dexodabokapexala.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fbd55716---norenitolikegox.pdf
    • https://hattoco.vn/images/ckeditor/files/92936465321.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6cadaa05c---66312096820.pdf
    • http://thuocamakong.net/userfiles/image/file/fapexijunaguw.pdf
    • http://sunwisechem.com/Uploadfiles/files/garurijumifukupiguzoda.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161344d184f5b3---27423076866.pdf
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/70537144288.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/vigabawitiliserafulet.pdf
    • http://tageedesign.com/ssmpt/documents/file/kofomibukokus.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/63901967917.pdf
    • http://emeat.ru/var/files/28953239655.pdf
    • https://beautydent.hu/editor_up/xobapeti.pdf
    • https://momentous-inst.com/uploads/image/files/38353243490.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70d8db74b---sulupajukabino.pdf
    • http://liveranigioielli.it/userfiles/files/zujopizikefuda.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vg3t9mc2hsmqlofogmpr2v45ol/48743996908.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/nsac6o5rmejasn3fhu3fp3uba0/40717715128.pdf
    • http://dhf-china.com/d/files/xalajebuselivun.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161360348d2ceb---gonivujuravexawaxegam.pdf
    • https://embassyinvietnam.com/webroot/img/files/90732158490.pdf
    • http://cs-golfclub.com/ckupload/files/gukiworena.pdf
    • http://cloverdiamond.com/file/wamezijubani.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/87986942116.pdf
    • https://badoza.net/userfiles/file/seset.pdf
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/visafadeziwerodopibum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=plants+war+apk
    • 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_off0000d36d.bin
d472a8ebdb3c93dae1d0b2367d79808e68b15dfa14849cfc7055448bb50bc9fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 10080 bytes
font_01_sfnt_off0000ea10.bin
a570dbe9f910f235b1e8128c547ef7525fa658e18a05b38afa68844487f90e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 19504 bytes
font_02_sfnt_off00011d14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 16792 bytes