Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2b087c360b8657…

MALICIOUS

PDF

103.4 KB Created: 2021-07-03 19:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd7cd08f80aa1f009f3108bdd189e6d3 SHA-1: e0963898195bb9a3f1a7e33e72a60129de33335f SHA-256: 6d2b087c360b865779ddbf8f7d1c39f140e6692260ec6b4773bf3c104329c816
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or a second-stage payload. No scripts were extracted, but the presence of numerous external links suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://smidgel.ru/uplcv?utm_term=pricing+in+general+insurance+pdf
    • http://haki.vn/uploads/files/nabemaziwarogov.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47c3bd445---nanusedopawepidosepoker.pdf
    • https://asiarsolutions.com/userfiles/file/kuwimiziboro.pdf
    • http://kengosushionlineorder.com/uploads/files/20985098258.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/mapuj.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/164c603916ada333e019cd09fef0d50d/memapo.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160853562efde6---64102042179.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/19a27b0ceb67ad99c248c2f769776e30/65571276254.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf74a42c7---bobuzugovamawa.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b553e5ade6---81619387854.pdf
    • http://inwama4.vn/webroot/img/files/96129880583.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da704d056---1976251420.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ae2sov7baun078c9k4vbp5bodo/82043876756.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608803a79fe69---jalisibemegiwulaniri.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/tebisokotav.pdf
    • https://pmms-online.com/assets/file/tiganevibasobukuje.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/voan249olf1do1gi59k1mh72sf/83461089851.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dgkink82qbt3o5j18g8hb06906/bukutipufozimidolaga.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc08046b7c---18190072003.pdf
    • http://thedreams.cz/files/72798101895.pdf
    • http://blessingsngo.in/userfiles/files/kosonevamil.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/7596856664.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f014.bin
d0ededf9ee9e357877298c807be2d7b4e9d3ab1b4edbc4cb39f4d0809d8f2879
pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 17440 bytes
font_01_sfnt_off00011dc1.bin
c4ee53c3cafd67d3b7566c93f5a43a0a5d00f9289f8ddadc3b8783cc9be05c8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 10680 bytes
font_02_sfnt_off0001360e.bin
e658a295d39db9e814bed024ee3c22853df07e569466f2f6ce50cf2259230b5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 23336 bytes
font_03_sfnt_off000178db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x178DB 16792 bytes