Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1dd2c19afc4057…

MALICIOUS

PDF

90.9 KB Created: 2021-06-29 09:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43582944adc631dd7049ac896e9c131e SHA-1: 374ba7bf25d2451ff146d541fff124f3aaede2df SHA-256: bb1dd2c19afc40576df87dce6685d958bf1e701b8950072f06ba112dae8a507c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. These links likely serve as a link farm to distribute malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=metal+and+non+metal+class+10+solutions PDF link annotation
    • https://ost-fogging.com/upload/files/45869046960.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/menijesumatafawokagufi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160869da549518---4408897634.pdfIn PDF document text
    • https://aitalk.vn/upload/files/gozozo.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/latiwo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c9efe95bb50133daf8562f416fe813ba/51026995745.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/92931883824.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/840469121.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160984309ca5a8---57546470355.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f23655391a2d714f02684be420ad0c18/tidijiv.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/60vh05o0grpgq3mkaeus20pki0/sidotuganu.pdfIn PDF document text
    • http://digifast.cz/userfiles/90812170344.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c5e0b32a89791620b79bd5f9751af6b8/dulixudisajazifi.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8c149a7266faf3181c9196619799fa6c/givaxonanokexadexofa.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062216563610.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/papelofufilimebivifepepij.pdfIn PDF document text
    • https://iwistw.com/upload/files/zusiwipedaxatovufutexize.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/22b34gcsfjoofe703aovpge6d6/wazapexumizanafeba.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/772db180baac0cdbe40c2aa6d0d2ac3d/makizodowivufa.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e177a4fa5e---gofuwasotapogerulugazopin.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081afb29034a---kenewutuvar.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_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10696 bytes
SHA-256: fbeff530e369167c4a0ddb8674b7029d9bded9979e691b7ba17dbf8ee0d3eff4
font_01_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 16900 bytes
SHA-256: 5afff1ac9615f168b9aac84bc20f96feae4d950a6a53e5d55a155dc8507dbe0f
font_02_sfnt_off00014667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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