Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b97fd71a8efe39…

MALICIOUS

PDF

72.7 KB Created: 2021-07-01 11:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33c6272e508cb6f29567092321562c04 SHA-1: e99c65b72742404c56e1729bf9621a543c3f8c6b SHA-256: 82b97fd71a8efe39dd68ebecbb568d35425ca0f69d6302480cb177e0707d9ea6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector.

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://hoteldanang.vn/uploads/images/files/32194505581.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac71a57af---riwewimome.pdf
    • https://silverwayshipping.com/userfiles/file/zugimozurodesep.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099d7adada9e---pototu.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b790e545d2---xerajune.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/tuxivizif.pdf
    • http://mooneyes.pl/userfiles/file/24543001062.pdf
    • http://iphysiology.ru/upload/59371581513.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c5526568---gigivakibaruruxuxuwen.pdf
    • http://dynamic1984.com/user_file/file/jerebuvototomima.pdf
    • http://zjqzzx.com/uploadfile/file/2021062518465173499.pdf
    • http://huiking.cn/uploads/file/072003186450.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c517bd82868---80068336827.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/79225417268.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d51a18ef2b7---rofifavukodama.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/82616542212.pdf
    • https://local-atlas.ru/userfiles/files/61276295917.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7fcf965118f38126d5d423a206f3cd0a/33308826063.pdf
    • http://mulroyenvironmental.ie/userfiles/file/zidedezijofuzuti.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/89b096962044c09d14fe3566f6e3f54c/48662439248.pdf
    • http://curry-box-deluxe.de/userfiles/file/tifowofut.pdf
    • https://wickedcheesy.com/images/file/burigenigadegumanulebuwap.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/t7qqco53c2j650qfeapu16ern6/55834793043.pdf
    • http://pinturasoltra.com/images/slider/files/fakes.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+howling+village
    • 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_off0000b98d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB98D 16792 bytes
font_01_sfnt_off0000d1a4.bin
0c368100c1d14b6b23f328d51584b8b3084f23fa0fd89f1b42c04be6bcfe5800
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 10136 bytes
font_02_sfnt_off0000e845.bin
13c5b5b185fef3a99c066d2ae24ad4c293a632de2f75981db62251f3519018bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 17184 bytes