Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ec950e5537fc8d…

MALICIOUS

PDF

164.0 KB Created: 2021-07-01 17:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e07eb1178ed9cbf0cc9da75ef6f55a97 SHA-1: 6dd94e696d74028ee4dc108262a12b3c5186b74d SHA-256: 61ec950e5537fc8d9b1f1fe7adfdf188bea1e7b3ed196acb2143bd6c9f244fb6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms 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 delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

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://www.anieliasfx.com/uploads/textareas/file/kaxoluxezom.pdf
    • http://icmasistemas.com/userfiles/files/vazisuwilorosiwebinowufo.pdf
    • https://greenfuturevietnam.com/Upload/files/6797804045.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/g565oh659bcoo4jmmuqmh75m24/mefoxezomuwuxisogi.pdf
    • https://zoorichi.com/temp/fckeditor/file/65969523999.pdf
    • http://francescofesta.it/userfiles/files/98691988828.pdf
    • http://zdravi-kromeriz.cz/files/file/zafaw.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13da8ffcf---peluxigaxedujisasav.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/daa73f2b2fbe7625e4f4f232053a73d3/jabejagajexazerinigomisax.pdf
    • http://soupworld.de/upload/file/96120554850.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e58e6504a---58261277872.pdf
    • http://www.zywawiara.pl/pliki/nalutefawimuxupepi.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8fd0c216eee87fe4eacaafb109b43ac2/39134174684.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebfb95b166fc512aec987daed18bc658/zelumelimeken.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd1f870e3---34377715915.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/4gjk6k97lhv9gnrp5ed61vq4b6/bopip.pdf
    • http://ducthoaudio.com/upload/files/sepolix.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094aee826430---giwum.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ef16d4208779dd3c26465828bc89aaf6/94779302245.pdf
    • https://sakkestadbil.no/userfiles/file/90376039027.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/pugaxebofewizunebifulubi.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b41c5edfc35875382e81819f4175a321/buleped.pdf
    • https://sharadsangam.org/UserFilesTwo/file/96245998973.pdf
    • http://ainut.fi/userfiles/file/zuvufut.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160774d950845f---30755059049.pdf
    • http://asupuro.com/upload/save_image/files/kojareja.pdf
    • https://ka-base.no/images_content/file/18126077975.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=oxford+english+book+for+class+6+answers
    • 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_off00022055.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x22055 16792 bytes
font_01_sfnt_off00023867.bin
4f4cd14c888970ba9ce77b2987c82b8041dd60b26df3e29729f948c6b9f20226
pdf-font-stream PDF embedded font (sfnt) at offset 0x23867 17932 bytes
font_02_sfnt_off00026772.bin
2875dcf645707a7f377c63fd8f77663cc03b3b00fa2c0447e5d02b8c5dd9fc00
pdf-font-stream PDF embedded font (sfnt) at offset 0x26772 11268 bytes