Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abfe834005b7e55…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 17:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4913fbfeaea2859fcbc0dba4e4ff6211 SHA-1: e3c2e0f9545da621d93c2d0dd8d23d237e0ec515 SHA-256: 9abfe834005b7e55af439e19404e36cdd380e7ef09344e855d421a2c64cbb9e2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it is part of a phishing or malware distribution campaign. The file's structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=unity+muzzle+flash+particle+download+free PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/54d5ebf05abbafca6c752674b6b31a8c/newidaf.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/32270be40ce26ba37568661cf0877cb1/nanunijitaxepijesopakojip.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/23341709393.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a25d845794a05816cbf9aeeef0432be7/mozajobujedirawekizonuwip.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/68419857828.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/44237072885.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/8972785658.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/48952248931.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/wazefunotanifuledoz.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/mebafuguwemafuparafaroj.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/72018340804.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/wajizenijujonufib.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/ledokemezi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a8647baafd6dd593d536a3192f723e70/kedodoxadorob.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/xoduvedakitozikebogip.pdfIn PDF document text
    • http://stevis.cz/files/file/dabemugur.pdfIn PDF document text
    • http://mlight.cz/archiv/file/watokezik.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/84241385803.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20211002221709_74i61l.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/97596399962.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/juminolikimu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/96889833115.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/fewukoligowedelapap.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/94318458600.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16153ce4d83ff0---kotizumifaletuv.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_off0000b371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 17992 bytes
SHA-256: 40707c7cc642935fd6d42a23c7ce4b2fde9991c345163924932fdd04573ce2f7
font_01_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 11252 bytes
SHA-256: abe735e6013e66237999ed1e5b025fb5b77430eac2b134146953258278c4b99d
font_02_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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