Malicious PDF — malware analysis report

Static analysis result for SHA-256 362b90134a94b103…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 12:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 305c72d0a84d9ce4e66895cb381acb57 SHA-1: 188691358acb7f7db13a9b95be4ed3a204293ea1 SHA-256: 362b90134a94b103a91e1d831610d0cf036509802ed8fe749de32bc9bc877d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm, with many URLs pointing to potentially compromised WordPress uploads or disposable hosting, indicates an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the phishing detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://squarcialupirelaxinchianti.com/writable/public/userfiles/file/50933362159.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8668c0dfc3fa12c8d757cc2afb44515a/97456451001.pdf
    • https://harom.ro/files/file/24067128822.pdf
    • https://ubitanduk.com/contents/files/54119016402.pdf
    • http://jinanxintiandi.com/userfiles/files/90272551006.pdf
    • http://saraya-shop.ru/upload/files/55785437627.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/sovubevetopo.pdf
    • https://dongciao.com/uploads/files/202109090043202462.pdf
    • http://studioaba.net/userfiles/files/jiwowat.pdf
    • https://marathonroller.com/userfiles/files/xovubewofag.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04fa4f409.pdf
    • http://mathcountsoutreach.org/userfiles/file/vekenavakuzujebakukewijag.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/rimatuwuwegisava.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e06051acd1399ca6af012945549a9982/31534052557.pdf
    • http://nbmounts.com/userfiles/file/1631274341.pdf
    • http://premo.at/userfiles/file/42647248051.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/nukobu.pdf
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/91147397643.pdf
    • https://cezartravel.hu/userfiles/file/32372175991.pdf
    • http://turksebruiloften.nl/userfiles/file/53545921102.pdf
    • https://vibanghanoi.com/uploads/files/mawiraxelir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pes+21+android+download
    • 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_off0000bc4b.bin
126219fad931ab3ce5466d5d1754a259d1f943cb52e6104c85e7efbb04d64678		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4B 10400 bytes
font_01_sfnt_off0000d416.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 16792 bytes
font_02_sfnt_off0000ec28.bin
a4f4743d867d6cce42f1ae4b2ceceb69c4237f5697d6d17cb5f5f07fa69b83b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 17716 bytes

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