Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b12383c7864e201…

MALICIOUS

PDF

76.5 KB Created: 2021-08-01 09:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36a5a099a11130dc5d59112a95b298dc SHA-1: d38561250e748e1d6a440492b29980ce3274a390 SHA-256: 7b12383c7864e2012bc07c446010b9115797e0a8d83293080b03162b9d33b3bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://monyetmesum.com/contents//files/rusuvajikejadekurom.pdf In PDF document text
    • http://chapelguild.com/images/usr/mojowadizoredurejez.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/367649193.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/vizixegekinojosujefutogi.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/90572035706.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/sebosolizalen.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/54861652957.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/36625533647.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/xelafofakidejogazum.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fb62fc8ddbcfac581a48c9a8148bc7d6/puwefiraxikagugeket.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ms5erciir3m2lvb88ei1fu6fpu/fenupovimisijelenuj.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/037aepfoqfqn9anaq0cq1ns517/lejizud.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a9f863c0---mivobowofubolukodaz.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f7dc068766d463f2451ae87d6c86970/kenademigavoda.pdfIn PDF document text
    • http://firegallery.ru/img/upload/zovowowineduj.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/tazifebisuzotarodavig.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/39960155453.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1fca2a0d7dfb67eb2785c1a7275089c2/kazuziwisipofuxuzetakewow.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160867ad59e951---48696340340.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/16992422482.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5228ce8971---buxasimomukitikofa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab89a2952---70049209083.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/de624bd6e231e3714030ab7c851d96d6/93071300777.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc2b4cc97---46027836805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fundamentals+of+engineering+economic+analysis+2nd+editionPDF 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_off0000c8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 16448 bytes
SHA-256: d507e0e9d36e6eb78eb6853b2e7d4ffdfa69209554802a64be17d7b88e5b993a
font_02_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 11132 bytes
SHA-256: bc691978aa132d130176a7374167ea276f5e146222e0358e8a283cb6f1218c44