Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bc08f01fca3e2a…

MALICIOUS

PDF

110.3 KB Created: 2021-08-03 03:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4713682438886b9ced376a8d38a48fed SHA-1: fcb8e455e4982146aaf7f953fc8fd998c255c648 SHA-256: 40bc08f01fca3e2a2c10364064b9819af675d2e3777040e3a3c5bda1396124f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection names indicate a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bai0kohp24p8ikmkjdf5q86bj4/81349436536.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/25dcf54a6e35277df69e3bd90c10ad50/kiguzovojumazunibipir.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/77663264241.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a77e526c85cc971c3a2536b094cbf701/44905232075.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/fuzuruni.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/pitopavo.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/6391879ada6c05b46fb5479b79f0f051/48263115072.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6482326ba6---196520027.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210705120358_w5o26v.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/85685944286.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/53613663914.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fee67c77a---japeta.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/sogubinugirujudonafev.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/88675132502.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/5d3034f114daf1778e254e39410009f3/jeguladudamojosame.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1f3prqf8u5dquc04bnmdj8pab6/savok.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/39190218696.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/gerizosawaxeba.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///fudunemidogebif.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/82553387639.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/kovelubabidujuzafozive.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885f44be2b3---nafetus.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/302244303813.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/sobobi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3feb3122b---90335269390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+link+samsung+soundbar+to+subwoofer+without+remotePDF 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_off00014911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14911 11208 bytes
SHA-256: febd902de41a1615d87037e68b21dcb47fae234b9d77d3c08ce88ab8212b5be9
font_01_sfnt_off000162e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF9 18188 bytes
SHA-256: 49dfbc3efc670b990e9654db003a318af46ada8cf08e0d8090f2970354fa6934

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