Malicious PDF — malware analysis report

Static analysis result for SHA-256 7764c4ab13d5ab2d…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 01:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f4af903de13bf616afac732ce691767 SHA-1: 0fa3cfe2cbcf637c179e2d9a699f7b2b2c2dfd62 SHA-256: 7764c4ab13d5ab2d88437618f5838585555ba88495818a15158c2e1a6f8f9322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites that host other PDF files. The presence of these links suggests an attempt to distribute further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bba37e07972---14259202492.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/cb2f8abf844a96c77530150a3757d9c6/xikenapatovosavozu.pdf
    • https://pet-fashion.ro/mm/file/87762700264.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7367db35a---85813449345.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16081794071cfd---tatozamipuvuwutomorosa.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d49f2100e---43162933869.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e6aec24fea9aafab3e83426998dc41cb/50224501206.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3ca395228b41e0c4a37c2f99ce19704a/jevuzoripodamuxanezurexo.pdf
    • https://luminex.pl/upload/file/29880487109.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/70026507724.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a9540dfcd---tazur.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbce45e5b6---fonoz.pdf
    • http://jinxinghotel.com/uploads/files/84810874845.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d28772160---rezazulel.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/wejew.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b64947a92---tigolixizobobexetet.pdf
    • http://poiskvod.ru/images/file/rixifusew.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9665adf01---ponijebuxa.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f71e7e142---66514872361.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1bc4787b9db288496a8d612452a604f1/rajogosa.pdf
    • https://banghenails.com/upload/file/latogatonafuziwanexeledu.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb2633b91---97320817134.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/vufezakid.pdf
    • http://gloucesterclassof81.com/clients/23558/File/lokagisagatib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=talking+point+ielts+reading+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_off0000f73b.bin
838445eccc1cab3274c683ba292ff08e4e1074f6495971808c4a6f1daca9b754
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 17072 bytes
font_01_sfnt_off0001239a.bin
881b3d7ccb8434b6a53b00b53a74f1cc2164d7b2bfdee16c1f3d5064fbb6088e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 10708 bytes
font_02_sfnt_off00013c30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C30 16792 bytes