Malicious PDF — malware analysis report

Static analysis result for SHA-256 858d29887a40582e…

MALICIOUS

PDF

91.7 KB Created: 2021-09-12 05:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8cf63a6ab50150a53927f8ff2dd605a8 SHA-1: cb512b2e4cc66d3e505a7b2bb83bfc8f34a63339 SHA-256: 858d29887a40582e9b73bbf5b3da07c81a4d942c20889b40e93db03cfcc100f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://baglab.pl/galeria/file/zinalunoraju.pdf In PDF document text
    • https://huanghecables.com/d/files/38396701617.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/24903293200.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/8931516054.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f0fa5e69e1fe3b2ac44bb8e61e161e96/voxefosamakukiwabib.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353dd8b16b2---xurewawalorox.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/11772524214.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/62541919674.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/96528402070.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/79885739612.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/12564824460.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/sabutegalo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5d2qc89dmc8171f0gh3kped54p/tikebotulebiwow.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jiwugapifajivenef.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/tilogugafisibipigejegun.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/sunisumudedijotevi.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/92083346905.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/jesod.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/77583323337.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/36005721310.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/58229115984.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/90023488688.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/rumikudalijovepafe.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/58119071501.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/pizajibumavuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fps+task+force+game+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_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 17720 bytes
SHA-256: a7996aed10b49a23a521a324f3cfd8b8001ea396950ede63a560a28f1ad837e4
font_01_sfnt_off00012fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 11024 bytes
SHA-256: b3e688643b41fda3dc42fa2fca6fa80c386f044c60a4e9a5dfd89d033b596a18
font_02_sfnt_off0001496f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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