Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2adef9c102e197a…

MALICIOUS

PDF

82.5 KB Created: 2021-08-09 19:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a437edf4530fd7ee9308ec79068c842 SHA-1: a0769cdf3ab7b695aff597cf9dd1ce975cb39f2b SHA-256: e2adef9c102e197a90897c46df4f67b9836aef7e37d9b39261f3789cc971039a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to compromised CMS uploads or disposable domains, strongly suggests a malicious intent to redirect users to harmful content. No scripts were extracted, but the PDF structure itself is leveraged to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f4g6h9ib1c6h07m4h0i9ls3ldn/wiradedaserobiwasaxorukim.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a622ce0c967---87513916016.pdf
    • http://princeverma.in/uploads/files/fixulosimexikatot.pdf
    • http://prinsart.ro/uploads/files/noxabirof.pdf
    • https://kompaspt2.com/contents//files/wukutew.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c0e4af7f1---zikewodeludedalam.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/54827993225.pdf
    • https://fertilizergranulatorprice.com/d/files/8813150411.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/61f7b5207a3ceff7387d5042bba7ded9/jexenelafozisusom.pdf
    • http://aaaexpressheating.com/userfiles/file/68388509778.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/e1ok1b9ulabqdldsle9o0h0pt1/pizoxez.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/kupuxovobakefa.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b5ec016d---1560344874.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a473d51956c---69412860476.pdf
    • http://sevvalturizm.com/rsm/files/banaxevelar.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e48d488ad6b449ee6e7f0589a062e7e/wetiked.pdf
    • https://mytekas.com/UserFiles/file/fumumumejaxekuw.pdf
    • https://anglarill.net/userfiles/file/74234785193.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc4541843---98529122103.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f7dff78e115294dce6410544027d6a06/guniwowuvabaleluturaji.pdf
    • http://retailcop.ca/files/26398864818.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cfb53541d---zejegororimuzutofebin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+to+word+converter+free+download+cnet
    • 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_off0000e023.bin
6bbd1524fabd06a466fb4867a1165883731d0c25f7c64477b3a229cbf4843128
pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 16920 bytes
font_01_sfnt_off00010c2e.bin
192db5ee95432d4025d189cbda8a6a9e4967acbf2b358daa5efe40dfc8b8f1e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 10360 bytes
font_02_sfnt_off000123cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 16792 bytes