Malicious PDF — malware analysis report

Static analysis result for SHA-256 de987a36eacf3ac0…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 11:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de8c4d328836f2dff0ed235064415962 SHA-1: 81bd58b21081d3ee58e2bb5aece0f3e5a8abdfd2 SHA-256: de987a36eacf3ac08d7f354f6594e3d599c2e1881e1b3c9533ed4f4ea97e6d71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=climate+change+report', suggest a phishing or content-luring tactic. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://inwebjor.ru/uplcv?utm_term=climate+change+report PDF link annotation
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rgf1lhsal8ahn1ah8rds59a40e/wogujisevatalubogevibed.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ecbd32932---kiwusopujezovotur.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612995f024b83---zafenujudiroragivomis.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/1895872473.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/74425980147.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmkt1mef4negk376llsaehi077/baletorasudulesepuxed.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/tiribe.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d6bc5392880d60d835ab71e7ca047ab7/834201276.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/88bca427e279e8595edc07be1dc22e9f/48047411311.pdfIn PDF document text
    • http://malifer.hu/upload/file/29690424818.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/26654399821.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/sotevejafowozefaba.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qqa659li3h01hp7u9pf52dmrg9/44526185705.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/41072044882.pdfIn PDF document text
    • http://teplospectr.ru/images/files/61433249139.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f05bf8ea895---zevajebipirafovokefagogup.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608272caeedfc---49207428855.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/pemomuvibedu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083a40fcc489---dibozodemebalenarid.pdfIn PDF document text
    • http://mlight.cz/archiv/file/fixugigavuxizagivo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b7d62beb04f8886628fda3613af4034f/xogesidefixine.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16105d64481007---sawawujir.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_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 10684 bytes
SHA-256: 53fdd6cb9240a8f28606f3ba264eb9308b2f62a9fd0c21c1dcaddf80e4b319e6
font_02_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 18380 bytes
SHA-256: d6084066fb75c7de110be403dcbb96565ef3bf9660487fdd02d19d36297823aa

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