Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d165f01f675de70…

MALICIOUS

PDF

94.2 KB Created: 2021-08-13 08:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77c9a1f5f02a5231d98354ef8bcfbd72 SHA-1: 71b521c62d9b8a8d3e484eb1b8f6c44f45159464 SHA-256: 9d165f01f675de70695528a5e372e43ca4270daaafa77c64fc5fb72eb46389bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites using the formcraft plugin, suggesting an attempt to lure users to malicious content or phishing pages. The document body is unreadable, but the presence of numerous external links and the high confidence malicious verdict indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161008bcd16418---3819662398.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae86436af---18024802128.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/mme070k2e06h96su9e64l5ugk1/23930027323.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/felitekitadegelililev.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d66a293f4---79745937002.pdfIn PDF document text
    • https://dietacud.eu/upload/file/85209460449.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/juzadigogabof.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/vozukamasakuxedozasuv.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef81ead07---70774980178.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/3582582815.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/kaludaxubivowazas.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/84110410103.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/jasadat.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tjadf18jpc18sr1265ol3j4jj6/16933767482.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/zaledaxuwanunilagene.pdfIn PDF document text
    • https://projetovm.com/uploads/files/mudukufibelapux.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ifaseth63s5dob1jqfdkg3shii/83731637298.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/gogofezetesox.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/rewakud.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/55904824207.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/72shu4ghqg61e13ip2il7hh4j3/vawifajibuti.pdfIn PDF document text
    • http://builderall.info/userfiles/file/90978317726.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lfcm39lp7q7uor6nooo0u7acpt/38427280035.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///siveperapowuvi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/oa7cnl9qh1agd7v2h2hgm7fkoe/77820150049.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756b592b3d9---24366443476.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ncanrbq4gumt7ek604a89vu4j2/sepugifapejufem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=super+smash+bros+4+official+tier+listPDF 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_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 19632 bytes
SHA-256: 12240b4dea5f4807bd6f04cb08db8efccf324256d1b210fa6232ebbb1fae1770
font_01_sfnt_off0001391a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15131 11032 bytes
SHA-256: 9416c0bb9f2ff3b9a0d3aeb0b3dc229ff4aa2dd134e135a27fc0df0aa76a773d