Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b7f27952d580b8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 10:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 979b3b80494ff9429553eae3e3c00d08 SHA-1: efeca83f6a38eabb180c46dd85f6665674696557 SHA-256: 26b7f27952d580b8d8eab009cd4d834c275226e32580584c7b167227ce335f49
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URLs and the nature of the hosting suggest the PDF acts as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=gta+lite+150mb PDF link annotation
    • https://karaari.leaddeehub.com/userfiles/files/96929694047.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/24817351660.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/29970440018.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/tixatoroxume.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/83609744246.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/3784084392.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/jigusefojalelezanomo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140730140978---gasolelatitoxudajilife.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a1167c30---5275964690.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210916_210122.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fdc2bbda---mozerifasizarukafixobuxu.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/13080532254.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161440a36da34f---55219646517.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/71309717598.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/57105977554.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/lapidirodumigi.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/94026472993.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/70603584368.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/xotozoxix.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/74646879698.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/domorarinipofitikunisemax.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21f26dffd---jegisufepuvopadaratukod.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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 10264 bytes
SHA-256: 484ebb528bfc145a605984595e53c66b78480bc4b0aad3f5f0afe81cde785cde
font_01_sfnt_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 17152 bytes
SHA-256: 97d69c7efd0d9d40574e89989732115e2d5c48d86a17aa84530146987d2e8da5
font_02_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1