Malicious PDF — malware analysis report

Static analysis result for SHA-256 3372604e6f4590b2…

MALICIOUS

PDF

84.7 KB Created: 2021-07-08 03:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b64c8d3d18e3b44f7ad8611debfa02cf SHA-1: b2b146f91f035f2989e78fb2064006191ec860c6 SHA-256: 3372604e6f4590b2909d1bf89620601dea0ab4cad8db88fd2cba44841827d53e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to various external PDF files hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/73571cbd5415fc7a5a026a601898ad14/61554317914.pdf
    • http://md-servicios.com/userfiles/file/sesuketokiwifalipig.pdf
    • http://reflita.lt/uploads/files/62759456321.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079972adecea---71525124207.pdf
    • https://mollis.rs//files/muvomifafezirojo.pdf
    • http://ezibra.pl/upload//file/lokowaxumalowo.pdf
    • https://erdemlerkoleji.com/resimler/files/28018613600.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/30908525828.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e52ad1a0f---jozav.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97c636337---nawojizaruxov.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b151e591de88fb1d39d85682c1af5ca1/ralumovuvo.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e21e7d2393a---67217233906.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b59e0cfc---selor.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/86154356293.pdf
    • https://pet-fashion.ro/mm/file/redid.pdf
    • http://quickvideo.nl/userfiles/file/tipodebinade.pdf
    • http://markone-tools.com/upload/files/40741670894.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160707b0ed92c0---kujuvagado.pdf
    • http://12shio5.com/contents//files/vodipobemopuda.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da89f001bf---nokuwitoxobise.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/000b64c1e50098731fa1ccf013f61f95/fijaxalazekatefapagos.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uq5q7q8j5q8d7gopif7u3j21n5/6433764050.pdf
    • http://yongqingtech.com/d/files/40651421844.pdf
    • http://chupanhnoithat.vn/upload/files/wokugifupowodufupumukisi.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26c811f33---75634125855.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+pursuit+of+happyness+will+smith+full+movie
    • 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_off0000e836.bin
cb9bd2ffab594b09e762c2ef0b25a8124d300bd2ba045658b5bef886c41324a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 10952 bytes
font_01_sfnt_off00010183.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 16792 bytes
font_02_sfnt_off00011995.bin
b24bbf7ed230fc0c58595820dbd7e80b7bd6aef65d2a59122fa2dadaa8e653ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 16772 bytes