Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0cb338fd18cd6b…

MALICIOUS

PDF

88.8 KB Created: 2021-09-16 21:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 999c30e0ce5c97afd633f82e9794fab3 SHA-1: 4d47284db6948918b83ffdbb6f79af7a043ea717 SHA-256: 2b0cb338fd18cd6b7d050412cdce74362d878a0dde86b4dc3e91d74612eb8e3f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness. The file's structure and embedded links suggest it's part of a campaign to redirect users to malicious content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.lukoilmarine.com/ckfinder/userfiles/files/bamoger.pdf
    • https://tomorrowhubs.com/upload/users/files/zuzisavodaso.pdf
    • http://biographiewerkstatt-singer.de/userfiles/file/46582725903.pdf
    • http://sensitiva.fi/UserFiles/File/1573563618.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/67431509672.pdf
    • https://ahreco.com/uploads/news_file/54387786492.pdf
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/66421396916.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/18176735110.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686ffa4ea6---17287850103.pdf
    • https://aashianarealty.com/file/23052554472.pdf
    • https://ost-fogging.com/upload/files/12059034238.pdf
    • http://zatuchlina.cz/upload/file/24158547950.pdf
    • http://artin-intranet.com/ckupload/files/borodikemexisevapo.pdf
    • http://vevo.keresztessyoptika.hu/elemek/file/28269765151.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e2351a63f3152cef06d2b92ac0a22283/96029978904.pdf
    • http://navrattan.co/userfiles/file/79540833132.pdf
    • https://aadharshilaschool.org/userfiles/file/65036979205.pdf
    • https://bostaninsaat.com/image/files/lerimejubiba.pdf
    • https://minjar.mebel18.com/uploads/files/popijiwekiten.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/97988426307.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32a317642---kaxivutimubikeb.pdf
    • https://conviviodihera.it/dati/upload/file/lorabipekifoxo.pdf
    • http://hoachattn.com/image/files/63342673266.pdf
    • http://fgosvo.ru/files/files/papiwigekagetegolino.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=child%27s+play+3+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f7.bin
0f1c2802f8b226b56beb190691f19f79e824d334262a9d0fda394dd5523f7c83
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 18156 bytes
font_01_sfnt_off000123d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 16792 bytes
font_02_sfnt_off00013bee.bin
55f4824bec55e6466e39da4d47c79767ecc454162dcd492c7fdad84f15407508
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEE 10976 bytes