Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8863ba7eecbce5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 10:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f1bf7ce83d9ddbd76c82179fbdd299e SHA-1: 929fc247564e0b8ca83c9209d79b98e70b6e8876 SHA-256: 2b8863ba7eecbce5711fd6f91fd2beb847e41b38b6d049fa6f981d0a30c96ba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cancercareresearch.com/userfiles/file/83923296959.pdf In PDF document text
    • http://theurbanbazzaar.com/userfiles/file/dukenulolawozo.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/xexus.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16135664b1344b---56695109856.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/9017388487.pdfIn PDF document text
    • http://www.polni.si/Images/files/36922095298.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138088235335---wunowixujakabifuxojawax.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/95599861936.pdfIn PDF document text
    • http://njchemland.com/upload/files/tuvejovazokamumopem.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/gezulewosaki.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/vifuduneralixirubu.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/jopotajiletidalupozawev.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/selak.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/sosedimujemezovuwusezosuw.pdfIn PDF document text
    • http://qzgj.cn/upload/file/32054358627.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/bopapovi.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/19390029807.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/voweru.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/49136780480.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132669346ef0---kogiv.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/13474104239.pdfIn PDF document text
    • http://cityfate.com/files/files/tulatutemazivijedotibus.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/kezurexozalomikasuvorav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=magix+music+maker+apk+free+downloadPDF 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_off0000b903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB903 16416 bytes
SHA-256: a9dc05ad33ab5abde425af39ca40e1b049444a1c96e08d47e7b3e5bf1a617349
font_01_sfnt_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 11236 bytes
SHA-256: e8d4666c4eb2f9f777c3460740e0c7e29794aff3a01caee7196dd1503ea282e2