Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da72b0a11372f39…

MALICIOUS

PDF

85.6 KB Created: 2021-07-08 21:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 834483ab4e871afe6a8fc3cc6d11ae9a SHA-1: c4e5eee822267b37433617ddf2ab1defcb3057ca SHA-256: 3da72b0a11372f3934aa9bdb6ae6751e3c2813938f4e5ad56d33d48ec76d96cb
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chameleoncoupons.com/adgprocessing/uploads/files/nozenojepirumijo.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2aeac7fb---96630940382.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f7d699e62385b97ac5994c98b7d41083/gowiguwimefonezelora.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/fe9acd92c290eaabddf3cfaf8d47e77b/mebonujezapabawaz.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fe96ee45a4cf1072ce2a85222d1ccd01/lotelemolitifikar.pdf
    • https://ruiguoex.com/upfile/files/2021/06/03/kewiminokimazo.pdf
    • http://computerdoki.hu/user/file/sikagoguledusosafijoniw.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd0587c91751943eacc322f372ed74bf/76473314398.pdf
    • https://hogies.com/includes/template/uploads/file/gelotanizuju.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f3bb058af3b35784d36d74fcccea7e35/44124605566.pdf
    • http://csc0516.com/userfiles/file/20210609193611_14jm49.pdf
    • http://harissarantis.com/userfiles/files/legaxabagikufojonev.pdf
    • http://stardentalcare.org/userfiles/file/57418327372.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094bce0b803b---2796479721.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6acd7d13---donuxotaveraje.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0nsq850eq15oqorgp13l1shrt4/47259893888.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gmi92sert7vqafgovlncbhfrhj/nigemigurobiduvodunexezot.pdf
    • https://anakaygame.com/calisma2/files/uploads/29321106999.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3372a24eb4a45450bc49a47cefee7810/70235119919.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d866b159ce---72473069550.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082451f3f6ed---kuguwasibibaxetedopilawe.pdf
    • https://peterdegendt.be/file/64637861635.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885ae7bb613---nuxesuxofizowini.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=easy+trivia+and+answers
    • 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_off0000e8a2.bin
fb4056c043be026cb884ea36fd6d2f240cd12de5b09ae8077fff4de2fc1b8fed
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 10324 bytes
font_01_sfnt_off0001001b.bin
f3e3631832277e114191554a6e3d89f717e17750662314de22c1763985f757b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 18868 bytes
font_02_sfnt_off0001312d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1312D 16792 bytes