Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b326473992712fb…

MALICIOUS

PDF

72.3 KB Created: 2021-09-30 13:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4823868ebabe88e1d4676ec0cbcf0df5 SHA-1: db699a2934d67d8141f821f1e0f4081c864af97e SHA-256: 2b326473992712fb04923fed1289ef9e81963bd3bef8edec072f9fd78581ce59
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML flagging further supports its malicious nature. While no scripts were directly extracted, the heuristic firings indicate a pattern of hosting and linking to potentially harmful files, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=vpn+proxy+master+pro+mod+apk PDF link annotation
    • https://laplacedesstores.com/upload/file/sebedudakufutosaja.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/fajegonutevuruxuvaf.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/46238218289.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/gululegunafotuxisadet.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/sexur.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/76405305621.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346e9f3a104---degolevoxexuder.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/49209652513.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390e1dc5195---kavagevubusubexavoka.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/juxinebarazixegapejef.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161437733c4ecd---vugiziwesolewoxorovifu.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/guvixubetorara.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/gojawamulegaremejo.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/zidudoruvuwimojoxazelip.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210924_234455.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210914_3E3E3B356B10B241.pdfIn PDF document text
    • http://partnercable.com/files/telegixutetowidaw.pdfIn PDF document text
    • https://digireg.nz/upload/20517274185.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/tavovirumepakekezoli.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/80275717021.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/1503359223.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/rinumupazerasijuv.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/84215175514.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ppe9q36ud6qh1t71g335aqal53/favatowofavodifikalepivig.pdfIn PDF document text
    • 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_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 18440 bytes
SHA-256: 72c036635b4b7decf5dc8969e02c787fe4791401c005735c0397bd86917b6174
font_01_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10692 bytes
SHA-256: a23d3b01e99eb02700aea7dbc535d7557e33b7b977d881b337a1a378ff1b1d7b

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