Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65b2c28f59a5a7e…

MALICIOUS

PDF

94.6 KB Created: 2021-07-08 02:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4420c1b6a19d001f7deeb67a1b9c33a1 SHA-1: ca1aeadbb436191f73fc22b374243dff8dd7300f SHA-256: c65b2c28f59a5a7e4a8cb97c318c350e2974bff1fbf718be394ea6a3119bfade
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters further support the link farm and potential phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e1cebab22fd0154cb3870e3d8bb1ca3f/78931092728.pdf
    • http://absolutelyneon.com/userfiles/file/kakererenatereto.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4836daa6dc0237097468ed987a44fb0c/56793046639.pdf
    • http://amandatravel.com/userfiles/file/22417269329.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e941b409cca53255b5e86b807183746f/15650297700.pdf
    • http://inse.us/uploads/images//files/nodomumeveluda.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f0c7d968d699b9fd06d5747eee5ab3c3/safajukovisaboxeleb.pdf
    • https://istanajpdua.com/contents//files/putajifovagarurubam.pdf
    • http://emirates-offshore.com/uploads/image/file/97229477590.pdf
    • https://bcbc3399.com/upload/files/buvamurezisewotusafami.pdf
    • http://galettedesrois.hu/userfiles/file/47780850496.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r2lgdl9ifhr8ib3d1ng4a4qu49/89313034217.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a977fa92775eb93948bf8df339f88840/datudebas.pdf
    • http://progfin.pl/userfiles/file/gogedakuxebixepajotoli.pdf
    • http://thinhhoanggia.vn/Images_upload/files/87893289915.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/rifif.pdf
    • https://kermoulin.com/userfiles/file/58284691903.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160909f63cdbcc---86402429146.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9387368ff0---60542036743.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/39f71b2bc1e36adf4d15b3472865cb67/dekaxunodagu.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/tnfhrlqst5isv96ovdvt5ii6g3/dufurokunozufimepigiv.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ded5eb9586b7b4c684c32582fd92e76b/lajemadake.pdf
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1625600965.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+to+play+woodcutting
    • 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_off00010f54.bin
5494b24228c69bd69d5c5007a36b407ea6b91e31d6660f339d98bdc2b3574c90
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 10800 bytes
font_01_sfnt_off0001281e.bin
9b1c797fe45791494e4d7aeec5ce311524e7497a9e5157b0557a22ff052660f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 17196 bytes
font_02_sfnt_off0001551f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1551F 16792 bytes