Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac1cd24424facb5…

MALICIOUS

PDF

86.7 KB Created: 2021-07-18 22:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63c2281580c1b01d92062dbcb306e4e8 SHA-1: f5fc5c529018dad864be398a9e35cafba2f081d5 SHA-256: 8ac1cd24424facb55de1eaaa3144bc691cee571548cc41f5eb16ef48f4896af2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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 http://immopolignano.lu/images/ludositumekukawuzerivu.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a317ca860dc93b2ff16eb2e00d8b544c/92679154909.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/97121933115.pdf
    • http://csc-0898.com/userfiles/file/20210613121152_ooghtz.pdf
    • https://stdtekstil.com/upload/ckfinder/files/dogibowefewajos.pdf
    • http://mousike.it/img_ins/files/muvobuvepetoxowuzep.pdf
    • http://rolmech-strzelno.pl/Upload/file/65925906776.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad20667a6c---99698103682.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608453498c4f4---wusobopofafedulesoseborot.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8d6cf72e6e444b021ccf2a23006aff7a/ravoti.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4215bab7a---9169746872.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/deb08036368b045a3adab4a2de36bd26/6836098514.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af256d62fae---golekigibuxibuzanalidi.pdf
    • https://astek-telem.fr/userfiles/file/pepikewulelisawu.pdf
    • http://yalcinsezer.com/upload/ckfinder/files/lakaw.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a0713b457---wugafumo.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608218f8da503---tajagutewirasetiwagod.pdf
    • http://absolutelyneon.com/userfiles/file/xudiraxefowovidobaxu.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160736ab019448---82807227772.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3fd78915---gejatidoxadobezegizami.pdf
    • https://alternativecarrepair.com/userfiles/file/63759757582.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e86db7b8---bevifenoteluxu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f958baf1e19e41a60fb6c7f1a3b10ec8/43883740597.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=diet+plan+to+lose+belly+fat+in+2+weeks+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_off0000efb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
font_01_sfnt_off000107c7.bin
71b224b11587db4903bb648a7b45e46345bc626d64949f3789a127efd65effa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 17028 bytes
font_02_sfnt_off00013417.bin
7de037f23e1fa3eb65d01f421564fbf5c969e7c8bee4cbaaad45c3897c4983ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x13417 10944 bytes