Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb5b681581b7d6b…

MALICIOUS

PDF

92.7 KB Created: 2021-07-07 03:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8feec02c7b65d50c1037c1d76da3241 SHA-1: 402032cb2cbd4ffab85a518c09c9b2b114dda936 SHA-256: 0bb5b681581b7d6bad02380e687e614cc9554a1edb93ab9285274d8bf7ee06bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs on potentially compromised or disposable domains, designed to redirect users to other PDF files. The presence of multiple PDF files hosted on various domains suggests a campaign to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://minipowerpack.net/upload/files/togaguzer.pdf
    • https://ajitcoatings.com/uploads/kibasenavuk.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/78525391825.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/772db180baac0cdbe40c2aa6d0d2ac3d/makizodowivufa.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/ea492ce9f55665c28073aa3ab077c640/5948374617.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87d85b440---tanarumipuli.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086be91db971---rasugigumelojoparaze.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755f4e315c9---ravediwuwegibagiwej.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7fda2e2764e791c65382e040d2bea177/dozopalumubuf.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93b4d0582d---50366779872.pdf
    • http://theonejsc.com/userfiles/file/jeroseluwifovipebuwezej.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976efb3f039---zavebupisijisujib.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d2fba3e7---94040154056.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d51db1bde0e175b5437a0d611086a275/89853051953.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd3b8099b---92220362083.pdf
    • http://gtshotel.it/images/file/77884277053.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16094688cdaf08---rozodirofa.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/h2bgo3gelof08spuqg2sfb2uf5/getosuginolex.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af7c114b51---66820290305.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/39b306774a1ff5d4b02f066cf27a0e4b/36843655139.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7a162aff---48180018994.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a4010abb02fb1f8fe521355e4d0c78fa/vinavufobupapoj.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nijagukeditovokakuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=applications+of+trigonometry+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed70.bin
3c6314c4b7c4896e019e2141ad1a75738c93b482b91e9e3cdfe5c8a1d6f96be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 11004 bytes
font_01_sfnt_off00010727.bin
b64e661e0d5875225f06ff72b9f74ca579991e5e929967c249b36cd38e44473c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 18196 bytes
font_02_sfnt_off000137c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137C3 16792 bytes
font_03_sfnt_off00014fd4.bin
1bb543891201b86cb218c82ce0c1e431878b85d3145a79f40ea94bf38162e691		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD4 16144 bytes

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