Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d675a93661dfd56…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 10:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7132cada1884b9f55c94eb637ac8e5f2 SHA-1: 2d1745a7ef2247e0b7caef525b0c39180104c252 SHA-256: 2d675a93661dfd56f8540143c370d609821107475a762628953af562655215d3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://srilakshmienterprises.net/uploads/15225875956.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dh2e0fkeerj5fgjt1uc6oe2ju8/83857105531.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/75123166416.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf43ad431---pedenulosisuwow.pdf
    • https://stallion-international.com/userfiles/file/jemuxowemoj.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0a58734a---pejavuna.pdf
    • http://seattleteriyaki3.com/uploads/files/vizowesidafaxaja.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/46594180790.pdf
    • https://nhanloc.net/userfiles/file/90002966379.pdf
    • https://graphicart.ro/fckfiles/file/11128483897.pdf
    • https://agronlogistics.com/userfiles/files/23589718872.pdf
    • http://profstil.az/userfiles/file/68941370602.pdf
    • https://sskundal.com/userfiles/file/disovobo.pdf
    • http://krasneclanky.cz/uploads/fezumewine.pdf
    • http://ntvietnga.com/upload/files/kojonajogu.pdf
    • http://villalapinetafavignana.it/userfiles/files/dujawasugebenisuw.pdf
    • https://nergizleryapi.com/image/files/37792173288.pdf
    • https://charterfori.ir/basefile/charterforiir/files/93952842786.pdf
    • https://acavacecio.it/userfiles/files/79663766270.pdf
    • http://szm.hu/userfiles/file/koloka.pdf
    • http://land89.com/ckupload/files/59962485415.pdf
    • https://mygrind.ie/userfiles/file/52916609373.pdf
    • http://bright-mineral.com/uploadfile/file/2021091518530448.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=aika+gps+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9c.bin
ec9ca4ea18a4cbcd1bf8dc0f9838d48b8bab3b0172db0eb3973173314e23994d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 18684 bytes
font_01_sfnt_off00010121.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 16792 bytes
font_02_sfnt_off00011937.bin
8202d4f50db7a0d11c7bcc75d414f23756b2da472d3eca285355a9f621089bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 9900 bytes

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