Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b9ae213bfbd03d…

MALICIOUS

PDF

82.0 KB Created: 2021-08-21 12:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc120b0741a3975d3d18d032e0b8c292 SHA-1: 8fd8b028e41d7ec530f5df6fb4de79fcdc8411ab SHA-256: d1b9ae213bfbd03dee93c6523c3fccc7598ab85a7ebf51f638db157395cb16c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a likely intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://suksesunited.com/contents//files/44307262828.pdf In PDF document text
    • http://myphamhelios.vn/luutru/files/53001679776.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5v1maq9vt30907d3ol5s5gf572/13887336695.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/tizapiwufizeruwozev.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f98ce7edf---kavoxudezimituf.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd37fe89eb---gotirovalidoxowivoxo.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/6282546392.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/50124670663.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/30e40fc998f71c18fffc73894d21da2e/wadogezatavosi.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/puvalik.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037c119d9a---54583072559.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/38843965666.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/58331904530.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/52183155081.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/39702974377.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/varigijibifapesijal.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vemj9a18gtnc9j6r4681crosk2/xavawojijabegesofuwo.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/70183079148.pdfIn PDF document text
    • http://ccshecea.org/upload/files/15804424697.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/63973751607.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/13424926567.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/45527708258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=simple+poll+discord+botPDF 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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 10624 bytes
SHA-256: 432f8e5f4fbf6ee8c5c76acc36c1e61580218475c41dd60e0d24771baed1c664
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 16800 bytes
SHA-256: bf78e4d30b2aa0358a3ebdcebbe760f908734201374e1e1d3648c8b2aca15078

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