Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd6936045742f68…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 16:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb602cf74836966a931f7cb03b9a5fb9 SHA-1: f0b8a641ea0f3d1a8c8ab97c789f9033bd71cbf9 SHA-256: afd6936045742f685bf0440b0fcb29cf3835e61bcc55624eb7e8fec96610e02e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d26bc745b---61190580068.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/04dfa8724699d9d1b1a71f5e37de9e19/436217080.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8nenfg4hg20ll2m493t0k3d5np/10476666957.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff157165f---bomajoboredutip.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e9ce5015c---7457183634.pdf
    • https://radmangroup-ye.com/rgfiles/file/55196839911.pdf
    • https://arhometutor.com/userfiles/file/98461799555.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jipiwox.pdf
    • http://brenna-ski.pl/userfiles/file/56324554487.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1324ec48---72353243513.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0d41c4a3---59263769027.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e9eb370e---midediwopu.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fk91nbuo9v21h16nt7li4i30ag/pawulijovozixupo.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e93ba039---zopezoker.pdf
    • http://dragonera.cn/admin/userfiles/file/lafodepasugesuneguze.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ab181b2bf9f172e647bb0721f88d066b/xokakut.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6597f3735---rojerepovotisavekaravik.pdf
    • https://gastriklandsbf.se/UserFiles/files/wakuvokopivepuwaworegi.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/dd1138f4608e62cf206994faff053790/bixegowakos.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/vemulepojekoge.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d3a26bf5fd0ac23057dbd0d77c37fca8/98794595641.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=biuret+test+results+for+protein
    • 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_off0000ec0e.bin
c3a934ad205cd45e10186b9cc5991212a3baa08341ffe69f51194015a5a6a47b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 17532 bytes
font_01_sfnt_off00011a0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 16792 bytes
font_02_sfnt_off00013226.bin
c5c52571b5ed89f3dbb4aaf42e57c00a93549d40b242e0172faebd24470e4743
pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 10344 bytes