Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c0abcc1bd51deb…

MALICIOUS

PDF

92.2 KB Created: 2021-07-01 12:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c4fe980d056ffe15ec32bc9821a0030 SHA-1: b3a85bc2123b7fb12607ad94372a0c93d89face9 SHA-256: a5c0abcc1bd51debb073f4461e787f4ec567b0b3dfa6dabc5c16d05ce8595150
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates this is a link farm on disposable hosting, and the presence of 'utm_term' parameters suggests a phishing or spamming campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3e27b47711faa91c354adfea142be655/79233052535.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8f95fe15d2a6ad57c64bb268d02295f5/ximepadegavopexoxolepov.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b05dc8abe656af5492f1d011681fa8a4/fefezasezovoluraju.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f7713206f---tenexix.pdf
    • https://securityguardsupply.org/php/uploads/file/dopavajexevu.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e89ec0686---nesariwapode.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/d24b1b08491520acd0c4bbd5b462f5f3/1032633883.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/rigoledeke.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891e509b2c9---wasoriniburo.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e03b257f7e---watigafu.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a3a0b7cfb---46550784998.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0a380e62b2801461da33b76195421af1/77171653247.pdf
    • http://aaaexpressheating.com/userfiles/file/31516114734.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ff12e993ac316f0350a68d8b9867a410/femabesonirib.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/879t08tmi6caqde9ujl28hgdfb/81709606843.pdf
    • https://agronlogistics.com/userfiles/files/fodeko.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s15vqp0pd4aole923fihd7k77d/bejovufemapajenubozep.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12c9c9764---buxakadosije.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607487aaf4001---4670355926.pdf
    • http://driver-jazda.pl/upload/file/gudanazulilurejevilimaw.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/v77soakkl8dodgstpb2suk8fp5/9245631901.pdf
    • http://bestbuyfromindia.com/userfiles/file/vigoloz.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160baa9c0ebc1e---51519573721.pdf
    • http://specimport.by/files/files/81809210011.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=evaluation+for+online+classes
    • 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_off00010508.bin
4b30194d0a50a3646891b4a2f1b30e6bbbae4a02c0727ad71734d238b7fc950e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 10480 bytes
font_01_sfnt_off00011cfd.bin
76f43b7ef247919e08ad80e677678fcffdf344a466959fb60246f2c1463bc68b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 17772 bytes
font_02_sfnt_off00014b8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8E 16792 bytes