Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c890aa0f7baaa2d…

MALICIOUS

PDF

94.7 KB Created: 2021-07-23 13:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a3a29e4157771d3af485e31ab7adabfc SHA-1: 916feae7ceb5069300ce609999ddc464dfd8c4da SHA-256: 5c890aa0f7baaa2d97bdf28979a31911ca80520ff359ba9ea97d6641e9d545ef
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 of which point to compromised CMS uploads on various domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

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 https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83311b8249---44720274716.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ef6bddf9e6759c5e526f31630212d4c2/44361962028.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/talefuxutiwuzepunape.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882f5d8310a---juwazinunexisomunas.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325939c0ba---xubosorajorulapuvuwute.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/sovb28c81277kug2fqb9usts1s/dotifobarogenajesuvolu.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/7cddee92a5697bc6f8a890029297084f/2657039735.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6b720381---15807469208.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b21221c6bcf2aa0fffe4661fe61b68f3/resaripevetawubid.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9dad207b0---95470512158.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/21136699265.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/m99li2bak2cl21bgq01i97cp19/fofalegiritukiwopeme.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/1851991208.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/wimibedekejebunumone.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/43236065020.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d95e52c5---zupowazomid.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/ketamejemirasenodovo.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/94733531708.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e205044d03---gefometuwexasu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/zutadutimibiliwixisazale.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba2364d6ce9a73b5d998c1ba17454b15/64232187769.pdfIn PDF document text
    • https://highrise.pl/file/delavifubifovilapusa.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9a0aa6e8a---mukikevemivuxixa.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca242ec53e---3694693177.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/52588311131.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/7599fd6ff538e63d1dd7465a7a1bd2cd/18135122261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gta+v+eclipse+rp+quiz+answersPDF 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_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 19744 bytes
SHA-256: c96eedcbd6a6ae97c471e1f4fddd68c23ecb8e9170ec0a5827bb38aad0b9e286
font_02_sfnt_off00015393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15393 10744 bytes
SHA-256: 2d4211f59485cccae5e00e956e200f91e22c4405cc66ce48e74e175aea4f65dc