Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c1a6867625e411…

MALICIOUS

PDF

86.6 KB Created: 2021-07-04 04:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f23bf950026bdb267a72d950a5835d42 SHA-1: 5475a929e2b5c02879a1fcf63fecd6eaf0692a30 SHA-256: 49c1a6867625e411a07653a6833217bfedd0cd09b21d39258c612ea5cf763a20
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised CMS upload links and IP literal URLs points to a deliberate effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=what+are+the+four+d%27s+of+abnormal+psychology
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/n2p24c4qgv0nd5bjmbmsrufr4n/69457528274.pdf
    • https://branchennachweis.eu/userfiles/file/gabusakozutajaredaj.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d865aa493---widujagodimaxetovo.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/363a5d7708418889a5a0f1306f4ed195/21591893958.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808198705b0---63575539144.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/91871ddb5eff4daeb96c05a90d01658c/rivowaviwigerunuxi.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b740a876971---25055341453.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dc481f93a1e3ef06dad4756f0746f634/71721508927.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/12fdac8530f2ded1ca2bf0fff35376e3/mijegubogusorokadu.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7adae1dc6---wozujokudu.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348abc7c3b---bewesusozir.pdf
    • http://pechati-piter.ru/userfiles/file/golixi.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/67197385780.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b1640b9eb---roxoxovegage.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8199d9a712556733792a089336904628/ririxidawotadedokal.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/gujapawunojoporigerinezu.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db033b82f1a---lefaxojizuzuvoduraxen.pdf
    • https://ancoraeducacion.com/images/59782931153.pdf
    • https://hizlipin.com/calisma2/files/uploads/kagokuwedema.pdf
    • http://asbufestival.com/uploads/FCK_files/file/48955127758.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a1324e72b---luxenodubabajaxarojetamal.pdf
    • http://alltechsro.cz/files/23838146967.pdf
    • 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_off0000ee5e.bin
e0853ed7b48678a312d8d44e6d400f1a805a74d8598828309758b408cdcb47e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 11356 bytes
font_01_sfnt_off0001089b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 16792 bytes
font_02_sfnt_off000120ad.bin
6b6fa5a11e6a5092b17535aaf4e68a1487a7f5f08af09ee3fe33fab48f132a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 16976 bytes

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