Malicious PDF — malware analysis report

Static analysis result for SHA-256 2807cbdeca988c8a…

MALICIOUS

PDF

85.8 KB Created: 2021-07-17 14:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 51f74b155f3c7ecfffda9d07128ec49d SHA-1: 1466d34a5489bfd5905a9dc656f90b3020f78eb6 SHA-256: 2807cbdeca988c8a8ada2fe045a6bf592199e36f25dbece71dfd26da53f5b67e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads, suggesting a lure to download a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa674ae462e---95644523730.pdf In PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210617102955.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ba7ad478c32aaec20ebf7630557db99d/bifaferajabivixas.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/44f6918131f7dce08044dc7fdb08541a/78330220141.pdfIn PDF document text
    • http://candientushinko.com/images/file/pakafu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076126f93221---legatifomolagadeb.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf2d7515b---16597771724.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/bajijajuwoniv.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70aa248682---golinolewelojo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a3ea6ec5---56567144246.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/99348655602.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d697e97317ce0b55a8132888c53e297f/15928191820.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/jeknvbis91hvu0g95ht5a852d7/fevatavofafutobarajusod.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2b5935453677799c34032603c4f2570e/80459249949.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/75127687157.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/zimozuwalisa.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ddd8b765---24547434857.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/cc6405efb2ea527acd3f033889f60feb/wupozerozorunu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f930160a2---26972260270.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/71626153974.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23dd709428---65820525424.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/93470255559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=a+packet+sniffer+isPDF 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_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 10380 bytes
SHA-256: f60f908de7e43aadd35b6ce5285ec8dca78d3c78f1ce562d60a61667ae1da8e0
font_01_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 16960 bytes
SHA-256: ea9e10b69f58e079f4817a9926dcdc1b1c5e89197a3903cc830d8edb81db09bf
font_02_sfnt_off00013337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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