Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efb555af46a6531…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 19:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05f92cbcb442e66015a8eef1791a7d3a SHA-1: 1e6a5fdb894a64cc4a9673ccc0c097f7e0f029b1 SHA-256: 5efb555af46a65319e65de1c6aa249abdbc3388578393cdeb89bbc83b9fc7ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is intended to redirect users to malicious external content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laborke.ru/uplcv?utm_term=sdrsharp+user+manual PDF link annotation
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a654616402744c51a9c5004bc85fd5a0/41917727082.pdfIn PDF document text
    • https://tsegypt.com/file/nabudiwufor.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/88176134477.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160e6afaae9626---80711245455.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/92348338202.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161234e5143ea3---wuzewazu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fbdcf2febad1a4414a339bcd59f31dc1/15048032041.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/95664756710.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davafematuporebefulube.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/dagoxujigegak.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/fopimomulanosabu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/13744603579.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/surawodibinogavav.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8bc400d35dcb088c97a0c01dafe4c7e3/lodexofeki.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/zibesavabosejitulugo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a66bcaa1a---14377399282.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab649ef6a---vimesufoga.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/30713492843.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/wulabikezafupujod.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4ddb44971---pakol.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/depifezozogipimutafoku.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_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 17476 bytes
SHA-256: ec2730f2b01295c566c8964055e2fd2c60ef0d194e38d1a452c0cfc7338661c9
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10524 bytes
SHA-256: 800dacaff2e0a665faba122af9c0fd9b2b3592569db08478c4fd89a5a6efbc03
font_02_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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