Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccf2586dabd9321…

MALICIOUS

PDF

100.8 KB Created: 2021-06-29 06:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb343d38be2c829b0e90245bca9f0d2e SHA-1: 508dc0a3d73f0c2ec23d77443e587f332d6e2a61 SHA-256: fccf2586dabd9321e0319f7c5d602a330ef8be0a1371edad639f2ac7fc3aaa77
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a context of billing or fraud. While no scripts were explicitly extracted, the presence of numerous embedded URLs pointing to compromised or disposable hosting suggests an attempt to redirect users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pogservice.ru/userfiles/file/wuvusuwapezowuxowid.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1sltvjeu7hd7lcu92ftiphb2l7/15694547158.pdf
    • https://mariellatriolo.it/public/file/dafurerasugorebogusavaju.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/9341b54d525204297000b6dfb70afcf1/25201504922.pdf
    • http://iberia-ex.com/images/blog//file/30348648737.pdf
    • https://biovuspharma.net/userfiles/files/58399402593.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba501f19d---doredomorewebileliput.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083eee75d53e---74733396736.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c67e188d4a4f22311a8b803bb580f9e8/18256610403.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f63e021c---97993132547.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/495d5eed1f0d9d184065af19556ad59e/rolewekem.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608098e13d2dd---vuxiveluvotiberekumix.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/38053588858.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/630d10ee555acaaaabdf2aff83675aad/lofij.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0dfcfd59697fffa1c6d3a9f62a84f935/53973378727.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608372808c03b---57272161843.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160900e716a769---kinusomolowema.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f51f3e24---nomidunatetaxisijowowusew.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0cafc146bbddf0a34a1ef97ac15b352b/97155920615.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/q6bftg3t41aekbl4jqcuvel1a3/90199652431.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/1rs5u1v75n8lr8rdibkcmbrpnc/64879047989.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1641a97b4---lunasanad.pdf
    • https://aulacvn.com/upload/fck/file/39862819978.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f93f7f392---47916792118.pdf
    • http://dynamic1984.com/user_file/file/gafeburavar.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607150379acc2---veluzij.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c518242f625---logivevawebaja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=take+action+definition
    • 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_off00012882.bin
2a45aa8d4621008fc3612e164370645b959f5e46038d4d3d53e413ecd1f8e9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 17752 bytes
font_01_sfnt_off000156a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156A7 16792 bytes
font_02_sfnt_off00016ebe.bin
9d5d83055181c59c14ec8f085082dcc2d92364a72f39dab333f79b83cb9dea22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EBE 10208 bytes

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