Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7580344b3dc118…

MALICIOUS

PDF

84.9 KB Created: 2021-08-25 14:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fe40c7c28d980c9c99be79c0bf3cb672 SHA-1: 02fcf9e65f7230916a51f5f24d6b93c72e47a3b0 SHA-256: da7580344b3dc1181655e8b88b05c685d6435fd1c06e719c0bd207959988b51b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://adamslakeband.org/userfiles/file/kekivigukemox.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892119dfc38---80989677630.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d54378d54cd7a6de4cdcd61f3ad91951/kenurusavusugedimen.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/3094495338.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6091ec3909f8a118a374c5aeee1a60ea/zuxubinobapes.pdfIn PDF document text
    • https://ebooksweb.net/files/file/rogudewejat.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d16e49217---niririneta.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l3n3a92opj4pfoo59kds44rkj2/818996536.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c17abdfd545dc5172a9e06951e57e3c8/68983716882.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad032b1e2---wizifelijibokosezepowavi.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/ziweripuzites.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/83936658428.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/a21be7395aaecf8e600887f5ba3ea358/50165737581.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/voxasimuzipusabepelimes.pdfIn PDF document text
    • http://policylic.com/uploads/files/sesanevodu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/27982217414.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ru2ehfmk59vaebu5oo41omt9k2/kupewud.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/zifitufem.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0752ea462f---kosadisaxilu.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/50461523813.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/40001511626.pdfIn PDF document text
    • https://akvaguru.hu/user/file/26049331897.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50bad03d2---lirufufatolozuxuxi.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/54072778483.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3d27d790be2a3b296c5a48344278c967/robelawediwozukazufip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=night+and+day+michelangeloPDF 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_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 17140 bytes
SHA-256: f699819127db58584d673b58ddd22af5671b19772e04e52b63fca10aa48df3a2
font_01_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 10640 bytes
SHA-256: f8799b0c41ea7604c80744b7333c5d1f07ea5d4666d022749fa36215ceb371ca