Malicious PDF — malware analysis report

Static analysis result for SHA-256 2016a5ddaa805dcf…

MALICIOUS

PDF

92.9 KB Created: 2021-08-12 14:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b33ff18f7902406b3cce78a5577ee4b0 SHA-1: fb5488c24b8e5b6934f5be67fa6efc42a4f121de SHA-256: 2016a5ddaa805dcfa696e78fe3bc121dac6febec84534ea28691918c3c0b8d36
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://temple.mo/userfiles/file/85610091000.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/dba6b0c850019c4200ffbc1db6feaa24/vutomoruvuwat.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zupimolusumavivojefuxuwu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/josakivogetopabowezob.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cacb50e8e---bozixiwojor.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b167c70d7---xipatotanavuse.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c166ae89fee---gefaxobafawadevamosufezup.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/xexixebow.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/zavokakilesanatabaj.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c27880fcd---sejajujefusipubod.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/lerer.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda5875cd6---95411274055.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f613f472bf---makadepikezosubamidoxiwe.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/675ndmf0nu51vq8fnb65o2v164/binununa.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/sozumepo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608baea163b4e---kujel.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/monamiwuxeremipudategojat.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac5623a125---xefizekelonemuperaz.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/1d4728838e8d2b22e3ab5744e2548f02/28843375385.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/xulogerej.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/a0ac898d030f41ccf46666f6fba11d69/migasobujuzenevifu.pdfIn PDF document text
    • http://ahchala.com/img/file/68365873917.pdfIn PDF document text
    • https://questyme.com/userfiles/file/tekudibazumibunemumalol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+nutritional+value+of+steamed+broccoliPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D96 17508 bytes
SHA-256: 337a792ba4fbbc3d4d822f547c6b4172fe0b310795e943ab5a3ef29f4f62181d
font_02_sfnt_off00014b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B41 11040 bytes
SHA-256: 3f65e7ca70eb8e7c330a201a292df12972552957b41e87a173da872ca83ad7d8