Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8a0da72cf09177…

MALICIOUS

PDF

88.8 KB Created: 2021-07-02 14:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 636a5c69cc984401f20a6dedac44f917 SHA-1: 10804e46c9440b6ebbc115e0770797cab2dd8edc SHA-256: fa8a0da72cf0917761311e03978f04d30b91ce5e0e13e3a700c2231262dcc97b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, facilitating the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/03515f550e0fc7b9c61c73d70e801429/46060526478.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079b92c8b120---72337399636.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/8dba945e42be614883e8845d795a03c6/doveru.pdf
    • http://aimic.com/userfiles/file/podibuvefemidelagezage.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af91997a2ec---dogolanumara.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b777d0a6d---tutakexav.pdf
    • http://ranjitabiswas.com/userfiles/files/85134556081.pdf
    • http://prodottoitalia.eu/userfiles/files/72955632331.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc71e9bacc2---81884995686.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xulopazizijofidapawi.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/22494755854.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c990c0a946b---kimomev.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/detusi.pdf
    • https://drsaman.com/files/62740942391.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/45897784335.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mfpqpu2fhoost78d574o799g4c/82449339617.pdf
    • http://karthikeyanjayaram.com/userfiles/file/86737049537.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160846897e0a91---fafofur.pdf
    • http://china-hold.com/UploadFile/file/20210516204441584.pdf
    • https://t2sc.me/userfiles/25605138198.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9frqcdbfnbbo3bn79ea6qemt9d/xifivawogeforovaxeb.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1e10a833b1a91a99b3ce8cea53fca0bb/62091179052.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=concept+of+free+body+diagram
    • 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_off0000f68f.bin
10c5e5c19876972dae854c12bfa876804b98d1096e37564ba64c8005476bafdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 17472 bytes
font_01_sfnt_off0001249b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 16792 bytes
font_02_sfnt_off00013cb2.bin
21450a224f2f9685b01195dd069e806636238eb5377f39c6e8fdcbbc41163ca6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB2 11036 bytes