Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c66a2384f34032…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 21:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dda22e474552f089624d346a1bcdd11d SHA-1: 5126a7010dcbbd1a04d8a7a145fb46e3d177bb06 SHA-256: 21c66a2384f34032509fa8fa216d3fca1415a59295bb51964610c35f116e4afc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=foods+that+reduce+intestinal+inflammation PDF link annotation
    • https://almuhja.net/ckfinder/userfiles/files/31746570249.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/90579354860.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/32460499842.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tarupuregodupakutopap.pdfIn PDF document text
    • http://fructusartis.com/i/File/57046722113.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/28c77e4fc049737d13714f24353091fd/33537891498.pdfIn PDF document text
    • https://coevent.ru/upload/files/jumefemufaxuduluxik.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/468rr6otpoub70k2204miuukt7/88501074636.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/42029845833.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43597f001---22826315377.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ivcg8sqdhrc2scobvp7jh9a01l/5726245783.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/58996588308.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ir9aub5gl8r85no7n9tvafhd0/kugipilog.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b5d9c9ef369ae3fefd6dc9874f3a640f/fagaba.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/iu2r6hbkb1g3o8fc8dbsec8re1/78424809428.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/zodupezezamejujugejanimag.pdfIn PDF document text
    • http://heureka-cz.eu/files/82551221592.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1873a8d52---dewokerafaki.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/luwurirekakulud.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c491162dba9c49d5be9d9029e2fe8c2f/40789467117.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/xatud.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d62a65c7a9e---gatafi.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/moi54r2j3d66q4ao11fbpfcc0k/zamivabam.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c108b516902---35306658176.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 16916 bytes
SHA-256: b757b46d4ea936d80c74c3d2276d786a8127407e931a96c66f9cfc5b79c28c89
font_01_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 10820 bytes
SHA-256: 16a3aad7b26fc72412b34071bb55c41c41f51b4cf7bfb02af258868cb0e3111a
font_02_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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