Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2d8aee3f7293ed…

MALICIOUS

PDF

81.7 KB Created: 2021-06-28 09:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf694c98f3391e0525099e169c5acc01 SHA-1: 94acf1f1f460443e60140660550741862c7c7c5c SHA-256: 8f2d8aee3f7293ed4641d28825cc9e410c85476c391774113c40a1b5161abefd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=the+right+winger
    • http://rudolphi.nu/userfiles/file/funozebo.pdf
    • https://sasalidayanisma.org/uploads/file/gurerapizaluxafebiresikex.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4k33u01kc5e1c1tbdmnu7vtt61/zetilu.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8c62ff41c5694a77b0b4256b42b12c64/61471160200.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160706333c1310---27129522056.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/05cbdc36a293ad216201ea1ce5bd8dd9/58864498923.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ls4bbthcskpp7tjq5h0no1aiej/mozekuvetuxoz.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/35d55189638c991ab8cc614107b263e6/biwurilukatodili.pdf
    • http://lakesideterracecondo.com/clients/41361/File/50799726746.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/1db5455124827ba81917b0fb5dc7f6ca/72475341437.pdf
    • http://www.centralperdana.com/file/jovojenoxawobede.pdf
    • https://acronimocostanzo.com/userfiles/file/bofotalanafoxu.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/659c3e98dc20d172e0b1d3d3d5202f99/zasosog.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/kuapihfdqk6s1lj27e4j8uuqms/medogifirimulipezekupuv.pdf
    • http://imaginove.eu/data/Files/56385926525.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/14269678637.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/jgucgcnegmj7dghci641spqe3m/lesimagewotujira.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35a03f2a9---kagubugejorov.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/56c3rkprdk4jcrj41c1p0ql408/bilazo.pdf
    • http://portalcom-b2b.es/img/user///file/_0381782001619806759.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cab67daa3b0a127d0aa9a2069afc0611/2935327858.pdf
    • http://notarbrazda.cz/userfiles/file/jegixigalesesumij.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/rusakelufezov.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_off0000d3e8.bin
70d3b975212f27f619a5662aac62a3b51cb9c8b00eccc43434bacba4fbb5210c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 9940 bytes
font_01_sfnt_off0000e9d7.bin
42f29ab34249f644aef0b0a3e4fcd11e9293505bdd1c68e70af3b57ca8e87f65
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 22344 bytes
font_02_sfnt_off00011ff3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 16792 bytes