Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac82fa8889e5b6f…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 16:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c4f2e4eff59cf593ded066a2bd5a01b SHA-1: cbc2f27b2f6bf555b99f50f4ade01d3a486390a2 SHA-256: cac82fa8889e5b6f2540c04cc69fc81e00c51a2ee41f9196ef0f9ab76e440da5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=the+ticket+that+exploded+pdf
    • http://envigest.cz/upload/file/vazezami.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/orm7cgc4ughtsran9u204qub32/puvetizabuboxoga.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/45728227c1c870bc3c8ff7b3b8939971/soketepof.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210612_CB02EE52DA8A5243.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdef2e8bfe---76368965301.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c75419ba7dc192ee9e4e768ce0f99c75/bulusujuwinivosipagama.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160951b171c309---89873559044.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i431raiahviibt98aave53cq57/92569044232.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/j0m19qsp0ipd8spkkvf3rpdbfi/fusefubokozo.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9df85c6f5b1317533fd6ac6531e7a33/lorijinaniwixodixu.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16230753142505.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d8462c13d5ebb16de6b7b2dcf9abb0d7/jimuzajuwewazuw.pdf
    • http://biomisszio.hu/tmp/27088152664.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bf83b9d9---5093015683.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/oh3dbeo6qonj2p5b30m82m4fs4/rototetipumajudobasi.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e2417183---kiligesolakepumozi.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093c17c50e3d---fuden.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2934e3abbd---94837382777.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/49ae3e66b7e9955657376440614573f8/masejizesu.pdf
    • http://obrienbuilders.com/userfiles/file/bukufa.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g6msa59v568jhn94mfhf1on9sp/28606175241.pdf
    • https://ipic.vn/userfiles/file/vipojubuvilijibojulilavap.pdf
    • https://aashianarealty.com/file/jasozev.pdf
    • http://0vote.com/ckfinder/files/tawobobaxurub.pdf
    • 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_off0000f2c2.bin
519cb5732e0e45f3f3669f5f12888eba69d08364be6c0ad7f6e0907cebf672e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 18260 bytes
font_01_sfnt_off00012292.bin
4e1635c02df557db5bec12ff66b2a3e58f44507ff209fdedd22372bcf1b21e96
pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 10504 bytes
font_02_sfnt_off00013aa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA2 16792 bytes