Malicious PDF — malware analysis report

Static analysis result for SHA-256 243fe3fc4673d63a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 22:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7925b8d7c4f2fed0627b78825e29df01 SHA-1: 0d7a19ffa820e275177290ef119aa9ffa6be669b SHA-256: 243fe3fc4673d63a4384735e1a1b8c19b3461cc00d2f4e5ac9ff1369809b57da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, with one URL specifically mentioning 'office 365 download crack'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/tigonudamalenopufazel.pdf
    • http://apsons.eu/files/file/pomonifenuzizemavukimek.pdf
    • http://chupanhnoithat.vn/upload/files/nepozilafiba.pdf
    • http://travelshops.pl/userfiles/file/91354077383.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614af67ec5211---40751235732.pdf
    • https://scalping.ir/data/files/file/lofamawelunetefak.pdf
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/zavosin.pdf
    • http://hpcad.pl/Upload/file/mirogedijevotefogun.pdf
    • https://lbk-ingatlan.hu/uploads/file/13366487348.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8d620399---22683668820.pdf
    • https://krossi.ru/images/content/files/67135902776.pdf
    • https://elegune.net/files/galeria/files/kiborilukevinudinugeroze.pdf
    • http://93564497.com/userfiles/10906475820.pdf
    • http://richardchong.com/userfiles/files/sitopet.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5140c144f---laxosujenumipa.pdf
    • https://olamare.com/img/uploaded/file/68295851870.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/37630399768.pdf
    • http://www.cerel.eu/images/wyswig_images/file/tokefonepuwidup.pdf
    • http://sov.tranovice.cz/webpagebuilder/ckfinder/userfiles/files/96965304155.pdf
    • http://kaitianjinghua.cn/admin/userfiles/file/202109190306153746.pdf
    • https://annekienlen.fr/imagesfile/norijekijevujumox.pdf
    • http://numismatika-nbkpdy.cz/userfiles/file/58849446490.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=office+365+download+crack
    • 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_off0000b151.bin
aac8d4435dfffbd94d1bc1e9c2e29b74fafa26b566fa5678de4cab1ee6a6b3b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 16252 bytes
font_01_sfnt_off0000da00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 16792 bytes
font_02_sfnt_off0000f217.bin
d7c0be4dff3461f73fabfb4fe739a09c207b3b8a7e991e8622d0ce8f4e22730f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 10880 bytes

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