Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb19f0660818b17…

MALICIOUS

PDF

111.5 KB Created: 2021-07-16 12:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02ac17f70148e450474d7affd3b5b2d3 SHA-1: 4520a130ce2a6dfa9b97cfce3b075c2dd6bb3a4f SHA-256: 1fb19f0660818b17f311e9c0eff7b034008c472426425fefef56d7b5ecf1683a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

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 http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e426ebcc6bf---56247718572.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210601_C98FF9B7FC977D5E.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3ou99ajhtoggdo849h7qi65n7o/12626868124.pdf
    • http://joy05.com/_UploadFile/Images/file/mepokabinama.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ij0a65ea92lvifiq4it9g4joo2/50679766934.pdf
    • https://zegabilisim.com/calisma2/files/uploads/85428612300.pdf
    • http://janandpoos.com/clients/872640/File/kopedakoxivawimomon.pdf
    • https://sanaspinler.com/calisma2/files/uploads/1666278308.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cb90811efa4933f14981aa1a810c3d0/zekakejilud.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/431oots10ubiq37v8k0etkqmlg/92537174896.pdf
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/62802928398.pdf
    • http://zap-interactive.com/uploads/files/54432370856.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/siwekurud.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d13ba6b1---42572771456.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/sa6rasqgrsil2064f92acpn3jk/jogejesepikowutasanave.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/98233552652.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c266655aa---98571778673.pdf
    • http://beveragesgs.com/userfiles/file/14548280873.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad921283497---bekupe.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/28ce0c7b64ea94b71c633b141d708871/lujonuvixikebikimina.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/soruzodifapozabofuwogedod.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35ed679fc---30225834383.pdf
    • http://teranor.com/ckfinder/userfiles/files/6643262274.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/46abf93a7aaea517e62d26fd77c77f1b/povixuxojexisimak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=print_r+to+file
    • 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_off000150fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x150FB 16792 bytes
font_01_sfnt_off0001690d.bin
e8698ee83b0632773ef714ebca42c7b5ca9935d2258610a97fa509fad2e5134e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1690D 18716 bytes
font_02_sfnt_off00019aeb.bin
2a199abf285fb29846d4128db1139606877e594b7da434d525a18fda1e4d4ef2
pdf-font-stream PDF embedded font (sfnt) at offset 0x19AEB 9912 bytes