Malicious PDF — malware analysis report

Static analysis result for SHA-256 984f3204a7b5745a…

MALICIOUS

PDF

92.7 KB Created: 2021-09-02 11:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7e459cac355b6ddec9d963cb0506ec7 SHA-1: 87cd912ad02ae4dc7b438b15a72bca4163af1e82 SHA-256: 984f3204a7b5745a847ded45f85ae892bd87d89db6772a1aca3d6f3f57b5d795
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to compromised CMS upload directories suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1723955383---ruxanaxegoragokirexidiw.pdf In PDF document text
    • https://arrayamed.com/userfiles/file/930674193.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/rimebeterolurefuviwejuv.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/151ac805d0b81c04e8943ace8b922737/kisawoloroligujogak.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/62df205425ae2ae08d083fd8f70f6fba/75126832510.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8662a9b56---vivopazinunudegufiweba.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/bifinoduwofumobag.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d7c74869---33065426509.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502131542337419.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/beginalamutogonole.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/pelejewalopimulovasu.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/29356525539.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/wizagoravitaludasafuda.pdfIn PDF document text
    • https://southafricapools.com/contents//files/jejulevibe.pdfIn PDF document text
    • https://davaocarrental.com/images/file/83695339508.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/mesativotovubap.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motuzezikegiw.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/56404548627.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/88801993567.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2f513448a9f3f26af3a391912bea63fe/27656270207.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/15446935631.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/m2uc44uq58rbvu3fl52v4nbok1/86122398843.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0fe7193f1a24fa17b3c488fa0759e4f7/76359301354.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/54093840110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=introduction+to+criminal+psychology+pdfPDF 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_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 18500 bytes
SHA-256: 075d82e6ba1c86e0e2102b00eb66651b2db00f3c406e6f6d0f776d8d667a554f
font_01_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 11100 bytes
SHA-256: 7602eff18f1f0e298e9a75056a63bdfaa217edc815ab2b762c295d164ac4d089
font_02_sfnt_off00014b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1