Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2288412b8dcf4f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 08:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 60becf75e9a5ca476bd3764c05399e58 SHA-1: 20a0b052e7715006c05699185931b82b8451233a SHA-256: 9f2288412b8dcf4f83d3ab818e86bc77d9a333cf51b986f6a4673cbfc1004079
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://psn-monolit.ru/img_file/files/vajikofilarodinewa.pdf In PDF document text
    • https://techielingo.com/fck_uploads/files/nigazavif.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/wekotedasine.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/70882489389.pdfIn PDF document text
    • http://htwy.com/upload/file/lopidetulapuxisogekera.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/65754121038.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161337a6c4b032---24459556290.pdfIn PDF document text
    • http://dongphat.net/upload/files/mekanekuveka.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/52255220732.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3b7b3f05---senimejurazabored.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b7fcb4a1---sigidimobakudexifikozo.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/60343061755.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/41081488444.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/91793406038.pdfIn PDF document text
    • http://saaretravel.ee/images/file/90207362310.pdfIn PDF document text
    • http://espokebar.com/uploads/files/34102254158.pdfIn PDF document text
    • http://fygl.net/uploads/file/020139376513.pdfIn PDF document text
    • http://01host.ru/userfiles/files/8898836547.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/lidutosupawe.pdfIn PDF document text
    • https://tigaintan.com/contents/files/95961560462.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/wefidetenan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=monopoly+slots+hack+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 18548 bytes
SHA-256: 75ae5c93a6be76b2115dcd285d8edb327dca4468c520e71ba3c2d06c0d3c5f22
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 10676 bytes
SHA-256: e19fd32a0fa8297ebe59addc56fc17944dc62d28fb306b93023018e6bd145049
font_02_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1