Malicious PDF — malware analysis report

Static analysis result for SHA-256 e580a5ffdee4f523…

MALICIOUS

PDF

71.4 KB Created: 2021-09-01 03:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42013bcc1cc530962e6a2f69014c9143 SHA-1: d0a8c0ee6b6e99f51047858d7f45e4a3e121e097 SHA-256: e580a5ffdee4f5234a48942235851645f6c6d530f3c9f166cec65431b2675cfb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=russian+aircraft+corporation+mig PDF link annotation
    • http://phillipsbricksalumni.com/clients/56168/File/sabuladataferi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/5647ab4a2599199ea4182c623d1953ca/16043360854.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e2be9963---98713162399.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b9aab6a6c---96274708786.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/xuwuv.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/64484047922.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/sezanibijedogupukon.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7e2075bb---95735493278.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a473ce24b---90557780601.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///54971138510.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/guzonadu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607596f5d0686---2969685304.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a46018c3ced---gagivubepajiwudobexogevi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a388eee452---53664123235.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59d2218cd2---faxaso.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/wonolaruloxikimafe.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071781b5815f---46176215925.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/vasetipimalo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3649a7473c5b7515c0b4d7d77b9981ea/dufip.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7171dc0c7b2be2b7625bd92fb36e3066/44121918278.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nitikefulititer.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/24163611888.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/bidepelazegilopa.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/fiditodewalemem.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8753f9df95---zinitivenagip.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_off0000b6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 10792 bytes
SHA-256: 7b9a48b3885de9aa241d82b25a7840a8590951d228cf48c02281368debdab0be
font_02_sfnt_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 15916 bytes
SHA-256: 7cfc44abee4d017f948bf1cf454cfee23f8f67d00ba46498728aaa5113a0ca21

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