Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ea6417eb1876b3…

MALICIOUS

PDF

78.9 KB Created: 2021-06-25 12:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5171db860ba97815edc3af6bef05b2d7 SHA-1: f69075b9d4d9e4b40f63a2b34a27b283ed42fcd9 SHA-256: b5ea6417eb1876b329762a7e753816cab4fc150cebe19864f24694608e8fc4ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=do+automatics+last+longer+than+manuals
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8d3e2c7790d3978916b4dcdaa21fbeea/10807059167.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9353156b23---3549569213.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b74b71465fa5b9e69c7fa804e900837c/97222649254.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7607d9fb7---jasitemiwi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b561db9bde1---tuzenavoretaratofap.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9bf5113b---tumalolipizugitogabenif.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/kubijijijebenojete.pdf
    • http://vitaminyplus.eu/files/file/losegewutavepezatele.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/komerijirafulivapek.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/h7h7fp9tb60gevvf4lc55hr8g2/58209136307.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/if058mrnvfi3gebb2mscorqpv2/49862472189.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/cef74fb9010c90a567209d1e2bf4b350/kaninorifawajujokewefuri.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcdb0eb7a8---41498705541.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0cd396b3e---98400643483.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_off0000d091.bin
44fb9c58650c54094b0c8ea0affb9dac95ebc23daf1996409806c4446dd07b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 10776 bytes
font_01_sfnt_off0000e92a.bin
d21fa6265dc73cd7f0ffad10405c8813e5c05e1ea2ff303bd21b4c130945b9bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 16928 bytes
font_02_sfnt_off00011516.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 16792 bytes

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