Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cb3138914430d9…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 16:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bf8693d1ebcdce4203e2d856b1bd2db SHA-1: 840f6253ffd8ffed971d835e28c52cc696b8bbc7 SHA-256: d6cb3138914430d94447e5fb765b52b56265f5de3e5250ef0f5521d8b55edbab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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=ppsspp+gta+cheats PDF link annotation
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/lofiboku.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae4635356---jozanukovupobuvofewesugu.pdfIn PDF document text
    • http://webursitet.org/Files/file/20843710564.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/gujusax.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/tuboz.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tubadizi.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/bazubozafewuruninaxeb.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16130433b601ee---82370174554.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/pobosakazimutuz.pdfIn PDF document text
    • https://phm.vn/upload/files/3770073302.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/44466578835.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/zipezopowatazibop.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/45058413431.pdfIn PDF document text
    • https://geloracinta.com/contents/files/644607492.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/42aff27a53464d9f91bad081b6211bf1/lofavobexowo.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-19/images/files/wuworoburibokovovuxevos.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/tomin.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/sofowuguvisetarixate.pdfIn PDF document text
    • https://labelmarket.eu/data/file/feluk.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/13954958561.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/jikawovurelupunuxa.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/ripodi.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/bazupuxoru.pdfIn PDF document text
    • 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_off0000ade8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE8 10192 bytes
SHA-256: 4f7b36e53c3d67ce21b741e3a89d025b404ddf6dc57ba201d1c5b82dfc0dbd35
font_01_sfnt_off0000c4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 15120 bytes
SHA-256: 53da494b22623f13af8362be608c779644161f92980f22ad874043e44ea6f773