Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2cfd3d8b38883d…

MALICIOUS

PDF

78.2 KB Created: 2021-06-26 02:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14744bdf4681be764f6ecf72ed58be62 SHA-1: 24441b10c072cb385006e9641cfc67c9a3bbc274 SHA-256: 3c2cfd3d8b38883d050018e11f1b25f58fee09b20e8ab68bdfed5b3c236f2d93
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to unknown PDFs on potentially compromised CMS uploads suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/qvct6h2f2dv8ck9uk84ve408ga/68584636635.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609475feb6e30---rigumaramisiwed.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/750a8a3520847fdb8a5acb43dfd2b480/xujuxanavubuvulupuwosut.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9f5c0d309---gebogiwerebogonoruj.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/249f02cd0d41eb95bf57eb24d361677e/sufapulula.pdf
    • https://drsaman.com/files/kefuselatojopapolez.pdf
    • http://amexeuro.com/an3_Uploads/file/58782185633.pdf
    • http://shengnabei.com/uploadfile/file///2021060304290991.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/20645795427.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cda2e2a7223---69333015649.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/c57aae4179341d86be648fb5b4f19747/10054095353.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac4ca7868---20986024763.pdf
    • https://triangle-electronics.com/assets/userfiles/file/27422502578.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/1300734182.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/59cb8l8g1nvev0n2v5aek2kei0/finisa.pdf
    • https://p87.hu/files/15608465890.pdf
    • https://info-jimukyoku.jp/lot/upload/files/xivozaxalaxamef.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/39d7ntqodoro1a5ffb192kc910/fimitubebenozi.pdf
    • https://starwebline.com/calisma2/files/uploads/savuditoxali.pdf
    • http://limoride.net/gallery/file/gonatupanavitu.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8e28o8oqp0b8pf1lhjkflnqtba/gimas.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7cmk84nokrnq4r762usf9c0jb0/xulufiwolo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed724dc19---lowanezurowafavaza.pdf
    • http://clubselectionvoyages.com/images/file/poxoxitipimumosolo.pdf
    • https://art-lamps-rali.eu/files/file/fekorosizelevipa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=absolute+value+converter
    • 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_off0000cff2.bin
6b3de1a47c5491b50abf2f7694a134729266547815638ba96812956ef0580a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 16740 bytes
font_01_sfnt_off0000fb98.bin
34aeab17876a61a585a05437f4463386ffaccdab5915742132b8579844ebc826
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 10416 bytes
font_02_sfnt_off00011378.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 16792 bytes