Malicious PDF — malware analysis report

Static analysis result for SHA-256 5675ab25ec1c9139…

MALICIOUS

PDF

89.2 KB Created: 2021-09-22 15:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b9d79895a7520f76a0579272ca26161 SHA-1: 623f7d8c19550b932d17110ab7f78d9f3068b263 SHA-256: 5675ab25ec1c91392eaa8ada67c97883c71cce3e979f21f6579b8754005c774a
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://astmasme.com/userData/board/file/64005949362.pdf
    • http://15449010.com/FileData/ckfinder/files/20210902_4E03B8732CE66CA6.pdf
    • http://snabsz.ru/ckfinder/userfiles/files/58693303100.pdf
    • http://bitree.net/ckfinder/userfiles/files/tavotirobotudofovadus.pdf
    • http://rivebistro.net/ckfinder/userfiles/files/72696403125.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140721f2ea36---sekewolewitupunulasudi.pdf
    • https://laundrybyconrads.com/nbloom/fckuploads/file/lupidimutaladitixofumi.pdf
    • http://greenearthgardens.org/userfiles/vamajebikowigikesa.pdf
    • https://98ing.com/upload/ck/files/20210901_213145.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5812ef5f2fdad3fbc80ae5e497c9a198/81779253591.pdf
    • http://hangtatmj.com/userfiles/93154886996.pdf
    • http://dtyxbpzx.com/filespath/files/20210918191617.pdf
    • http://khonggianmang.com/upload/files/81029969632.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f239d6b65d08276d75fc1fc07082d5dc/53187675603.pdf
    • http://tomaszfilipczak.pl/userfiles/file/ritug.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/jazomitesupabojo.pdf
    • https://alkirbilaw.com/userfiles/files/denedesagoxesovefuva.pdf
    • http://besttailor.info/ckfinder/userfiles/files/wadiniwefadojatowi.pdf
    • http://phanmemerp.vn/attachment/files/mipukenikifodumonamapor.pdf
    • http://otworz-biuro-podrozy.pl/userfiles/file/36033400050.pdf
    • http://creaorganization.com/depo/sayfaresim/file/xevijoretomale.pdf
    • http://soles2walk.com/data/file/31631181997.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d42d24f32---reromenaxepopivap.pdf
    • http://nfrostov.ru/upload/files/37017454843.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=windows+programs+on+android
    • 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_off0000f9d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 16792 bytes
font_01_sfnt_off000111e6.bin
ce8fcdbae2dc872f5a64794525a40dbba9129033ff754f03338ce99c6d9359a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 17568 bytes
font_02_sfnt_off00013f2b.bin
8c256af107ffe2a7f438cf4b7c18fab83c6daa0dfb944b9894e7327a4a336293		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 10540 bytes

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