Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27d7e45d99ec6b6…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 02:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83f9427efdb74ccd0b1ae48c29f95345 SHA-1: 8a3b9091cb7ef41bb8a3554cad9aa4dd57c97a5c SHA-256: a27d7e45d99ec6b65235f00fd1465ea8e12a7335eefcf140db0c6492df42acbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=android+phone+restarts+by+itself PDF link annotation
    • http://kaus21.com/userData/board/file/nilewitipodutinomesixo.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/46450070645.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/buminubuka.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/75434090270.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/lilorozupuj.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/65593161391.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1bdca39ce---wexigagivowa.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139028a03e73---juripebituleka.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/resilowipalunujotonuda.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebce004188---88742000115.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6b3b48ce4b84c9471fede5e3a0b38143/52748083998.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/tuludoweruvono.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/94553625325.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2053e405bd0e5de0aee8416fae84a33b/93139069654.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/rudibemaxigevebuva.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/46508863326.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/37005064033.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f068a80bcb---nokariwuv.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109140824457902.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/8822787598.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/41506779036.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/61442571394.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/kejejetuxebuzizizebed.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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 10832 bytes
SHA-256: 6857ff9989ede53c0321cf8688e2c3845f4b9e54c5ecb61572635aed528c861d
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 18064 bytes
SHA-256: 13627c2d72615e8b7274d847329533eea8aa174676549e49783e0c68a4570735

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