Malicious PDF — malware analysis report

Static analysis result for SHA-256 92236ff33a08c0b4…

MALICIOUS

PDF

86.8 KB Created: 2021-07-10 04:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1e5a26d0dd199303c3086185629a0d4 SHA-1: 827dd398b619eb968b53cc8d45233916a546b849 SHA-256: 92236ff33a08c0b46078c22a0809ca3087e0013b2eadf3e3b883f076e65eece3
156 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to direct users to external websites, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://juhaszautovill.hu/userfiles/file/28021263671.pdf
    • http://lawrence-spruill.com/clients/42275/File/75394869965.pdf
    • http://bioscipublisher.com/files/upfiles/file/57601068843.pdf
    • http://dharmapremipariwar.org/userfiles/file/wavibuj.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7af9fd1e---95360173541.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2r3l2a8klpbgf0dj1q3ttjlgq2/lobakuzadezevarapes.pdf
    • https://jokerprod.net/userfiles/file/29515893491.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f43f698d0---jojum.pdf
    • http://heyumpnd.com/userfiles/file///54507653565.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/8817108463.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cfe5d91a---semeposaketikavokoge.pdf
    • https://alutat.com/data/file/rupifo.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/90401199776.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/1s4q50p8abracvf6thk6s14a48/lulizanitolumaw.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/9hg698cm53gq0t214a979iccak/gonapevuwoxabofejafi.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/eo3iudbdt7pdudukhcetq9e5m2/39685867760.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/1048433ff75c470ea451b97cc6b3c9f7/62582377451.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ce70dc2a---fixomusepifo.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070596dde54f---wiwomuridudiwenezisafuda.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f64a84df32148162c103d678985a7d69/2640259161.pdf
    • http://ksnjl.com/userfiles/files/gobufaruzarere.pdf
    • http://smepil.com/ckeditor/userfiles/files/rorizazag.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/fibajivivebipafoxaxa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=movie+names+for+dumb+charades+bollywood
    • 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_off0000ec15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 16792 bytes
font_01_sfnt_off0001042c.bin
f2342379a05cf0c12911944569827145f2715bdd9da2cf9391f19c0a09d01c34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 11140 bytes
font_02_sfnt_off00011e08.bin
a1307e7685382d4336304690b59d36d7f6aadfb18214d43a5cd833d1a97b8c7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 18564 bytes