Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc8d449eb394f11…

MALICIOUS

PDF

96.8 KB Created: 2021-08-14 05:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1ad08b483eb1dad9932139e75b00a23 SHA-1: d55701bf0bc3b941abe888be94c9987fe798ed6c SHA-256: 2bc8d449eb394f11eecd5cbf698ae4024decb573b86ed6e9599e9eea79b09238
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.yoko-ono.be/images/userfiles/file/liveligatuxokelariwire.pdf In PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/81280371286.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/36387934588.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/zifufizosikobagili.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-1/20210601184217738164.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/tipewazem.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/h5r3dg29q79skl959jt8erplrv/65188233693.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/83494727790.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c88654a9714---77225110929.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/75727213776.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34246e080---senirexule.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b9c5bc67---rumanen.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/merewivenufixex.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/1865474037.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/gimoxatuvuputofejikeworij.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16084372e6ea8b---24280878044.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/visowepobomejejonupavozi.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/95350005459.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3ec05ef3074f704a7fa33c8d141afdbb/98518162678.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5b771d934a6dd1c8f2031418839b03e8/jufezutoxiroximupu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbed021b2---vumixosefotilop.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/ribujuxurogadiwadugu.pdfIn PDF document text
    • https://kartplast.com/resimler/files/rumovetexitiwuzak.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/99p45mmqsv330dj6i9jep925s3/38255090989.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/kujijizumebezosizaseraja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+a+c+class+gun+license+in+nswPDF 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_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 17188 bytes
SHA-256: fd180ce25b8a498c14f5d850a88ac65342f06d4dd9fe074a8e87c1cec2ab669a
font_01_sfnt_off000144e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E6 10480 bytes
SHA-256: 22cdea463ac43780ef2aaf016343485f142e68c00f2960f73597451d0d5d2afa
font_02_sfnt_off00015ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1