Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5b1cb8361f4ee1…

MALICIOUS

PDF

84.0 KB Created: 2021-07-09 19:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21ee22cb3892b64cd6ca80798ce95cec SHA-1: 04fed7900dc9c8a77dea36169657e8809937bace SHA-256: dc5b1cb8361f4ee1b5e1732c2f6e76ecdddab4b0d833c0089b0f46f1fb9cbb16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in some URLs indicates a tracking mechanism, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=musculos+extraoculares+pdf PDF link annotation
    • https://wecareprogram.org/images/file/levajofikenisameguvuvawib.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/15610012647.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7cfe86905---45246919564.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/25163470026.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/duramiwove.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/nirimexuwedavinigasomife.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a181dace2---37941419121.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f7ae573d8---77344818063.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/87715312912.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/soruziwudoragubawiv.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3326378a---bewejexututekot.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ae6a5d8e0---pobinofujavavolewi.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/bujesusimubo.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/1545414504.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/24592385835.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea63b104dc---jinukijonutusajonesetunif.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/84031272321.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/duvadilemapadoju.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c315b076f7---59245489711.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/2490275535.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/98633769896.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/s9tvqko0b3d4sirgog87i12sik/jitapanitalutetijuma.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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 18596 bytes
SHA-256: 5898a21d9fcd95569671f987efb3ed1e40b22a1bc770d82ef9900cb0a48c707a
font_02_sfnt_off00012924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12924 10612 bytes
SHA-256: c16a294b43272e7d4ef75399f3c9507ef13663046fab281ce5ab8ec34ac68f3e

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