Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d618d1fc8c0c61f…

MALICIOUS

PDF

125.3 KB Created: 2021-06-28 11:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3d8b2af54a2f90663143894386d9a01 SHA-1: bf22b386e14ecd942db93a303deabd8142c31533 SHA-256: 8d618d1fc8c0c61ff9b88263e1d449944fd95ba673c724b2d2234627240fa7a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://synerhu.ru/uplcv?utm_term=henry+rollins+weightlifting
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5bu0p1boemlci8h6gmg576r41k/30488315134.pdf
    • http://weberstellen.ch/userfiles/file/wipenetidiremugew.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bgrje99rjfbtu18f6r09hceg7/netopetiz.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pa3dbb1v0a4uetp9flu880uqkl/71751971791.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7e429f86---bubixanulifan.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-19/20210619173336496131.pdf
    • http://deccanquest.com/konadnew/userfiles/file/47759720917.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c33ad10669950df64209ef0eb7e42564/52197645690.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/c8dc4a043d886b0d98f968c423bf15dd/soniveze.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abf72454941---6985852297.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/733ca81bf47918a6e83a8cfc17ea5c4a/66259767859.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/dlvmspdbjp1h3n99k84dgklav1/fiberogorajamojo.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hli2lae6e6cro7hmt14duislf0/xuludopidorafiwelilubuv.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9b916a1916577b3bde50980d3209b2c7/fedone.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6r8ubmv0d25upec40646nis2eb/xikerokukogutejoxekuf.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/76728066005.pdf
    • http://firanywiktoria.pl/uploads/editor/file/68377723716.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5bc9823f---52098663575.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1cf9cf54b---jorilixuleto.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3ustnmpelshk9qhio7kcm99sje/45321151487.pdf
    • https://bustotoronto.com/userfiles/file/kigenuguxibilofepedezon.pdf
    • https://consurs.ro/ckfinder/userfiles/files/93611718061.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a527a8e6c---88423690155.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b3db1b4384772241f0b63800dab8962c/gilelegosuxivoritadis.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/36cc496efab12aefad254dd368c9ae07/ketefiderejulivuwujot.pdf
    • http://auxerretv.com/content/public/file/buzuwitev.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dbe11b6a9ddc83c854debaa0ffdaeb6/72388879351.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d1fa43221---33761907133.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_off000186fd.bin
5579098e123d84dad7f7254b566d3874c467604215e3a321dedab255c0a683ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186FD 18580 bytes
font_01_sfnt_off0001b719.bin
011bef7e1e2eedfd96300eff4cce91e01b4912dc9e79a4bf1875466c99ff5224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B719 10524 bytes
font_02_sfnt_off0001cf06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF06 16792 bytes

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