Malicious PDF — malware analysis report

Static analysis result for SHA-256 501d9c19b4311478…

MALICIOUS

PDF

89.2 KB Created: 2021-07-23 03:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2ff57261b4778baff3d1e640db6ba32 SHA-1: c467fda5d542ca3a2bc7b871983413f845073c5c SHA-256: 501d9c19b431147899504fdf6cd2d03d4af691c837fade8ff4b0abe0f4d9af8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://andreaslasnik.com/data/files/mubogeweku.pdf
    • http://laros.cz/UserFiles/file/89394980365.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d16167948b3e45241850f78883d96df9/94986399667.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608326f19ef92---wiwawonuziza.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/finedatuzaxonekonu.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e4f88238ab5df10ed15882b5a3e62d63/goduwupivilowe.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccb83e3c98---93498021451.pdf
    • https://angkagenap.com/contents//files/934754672.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/81c77c8c52d5105d30737f6e638f7cc0/sesezumupivigolimitazono.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f88fb163f---4250901055.pdf
    • https://paperland.bg/uploads/file/28497892770.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608777ab6c24a---35117126323.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d019cacfccf---fuzekov.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9913325fa26d48b3b4799958809fbb16/wamuliwuf.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nq3mmkrjsv3ra1th35900kcmp3/74384966651.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/95u34fg02ak5p6lnal8sdu8k3k/76554531044.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7f4bb190f561a921a8ea659563904634/jevujoluzekom.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/bad9872752e6a80e61610245674d5928/80007450435.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ec4676308d29f9ee6d44dc134e7e1532/12793832677.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9e886bf92---98124615318.pdf
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/35471136623.pdf
    • http://heorungminhphat.com/luutru/files/76497424866.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zukitotiwuvemigimoneseb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=white+line+on+lower+eyelid
    • 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_off0000fc81.bin
d65e6b6cc7f207acf10c32a340c21614590e7ee8a643968788bd27f14310bec9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 16772 bytes
font_01_sfnt_off000127f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 16792 bytes
font_02_sfnt_off00014010.bin
ffe51a75b6f28ca76b7fe74d1c5508fbb17f58287d50e58960b162ab1371af2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14010 10208 bytes