Malicious PDF — malware analysis report

Static analysis result for SHA-256 c387ee7f48ff155e…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 21:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df4a532b97f6266acebf0d59f0013fb8 SHA-1: 67d376d7e14d375c3310cbfe14077fb7730d5213 SHA-256: c387ee7f48ff155e5028d77aab7717c4ec69a158f423bff66128166c7ea7ee81
156 Risk Score

Malware Insights

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

The 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 numerous links pointing to compromised WordPress upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f9562b081---mupeminaxakitekugugip.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c3672660---48055202669.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ab73426d9---fodebemiwasawepibiv.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5e4ad6d8e2352b5ff30a3a167511dde9/12624462927.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d422fc5d37---xemudepu.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160acd70428b75---83282856077.pdf
    • https://resulgame.com/calisma2/files/uploads/nopajokuk.pdf
    • https://mamo-tato.ro/userfiles/file/kopofalanilaxixeganexo.pdf
    • http://vksraja.in/fckeditor/upload/file/pejilodatupazamelunen.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/72n8doga84pke9lnr28ga9ac7f/sosumaduteriwarutipalakiw.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/af11876e00d8aa70197f1feaa0fa5c4f/29125960751.pdf
    • https://campermagazine.tv/public/file/18244375976.pdf
    • https://12tiga.com/contents//files/26518107771.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839d1736f90---61893233540.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba0e71b9f---famureratexep.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/s035nv8sob7094aimcrnlfth9s/94113518838.pdf
    • https://cytairtool.com/test/userfiles/file/20210618_df026.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082fea8bb5c5---36707036566.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a963199ad5094f6ad2e569aa828572a2/dozodaxorakutijaka.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/74dl0j3ms3mv14h930sd3lfssf/nazele.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+craft+an+eye+of+cthulhu
    • 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_off0000e5db.bin
6518b2f93e7374155579ee9bc60fc5d62ee12f20fcc9be916e4b5b93e94bcc21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 10464 bytes
font_01_sfnt_off0000fd95.bin
aa4eb69e383988566832e14a8533dcecc35b68bd475964838b681b6b3577d485
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 17940 bytes
font_02_sfnt_off00012cfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 16792 bytes