Malicious PDF — malware analysis report

Static analysis result for SHA-256 834cc5fa2c471c99…

MALICIOUS

PDF

87.6 KB Created: 2021-07-26 05:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3872f5ee75b1035bbf3961bc8a8aa48e SHA-1: d974e31854c35377f74230f2deef80997576f98b SHA-256: 834cc5fa2c471c99cdd4938d9aece79eb3b62bb8da2cb0aedbb1c5959977be85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution lure. The embedded URLs point to PDF files, likely serving as further redirection or payload delivery.

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/dc66021b10bb0e9a821957c122022c0d/tenodisada.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9b4fabdde---33258638256.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/ladirogabonabulepegot.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/12675cb0adfe2ebb971d8aecfbd4ce0e/zaruzibufelafewedu.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/62a652ea773f08467df38f91cd805200/tuvaja.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4bcdee484---ravuvemaditanimume.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d644593f---sokumekifigulasiguseg.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b2abc469d511523586c976fa3ab8d226/80710171691.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9d621c67e---sumisexo.pdfIn PDF document text
    • https://tessuno.com/upload/files/60f0e6b9cafef.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tklpq4feu6r89vnlm3kmc5tbc1/rutapozugigosuparixe.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fb69e794---xelitapefewufiwumexe.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3bfbc91a4d44d60965673b14d16b9110/tezodupereminamebuwatadav.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/sofulititavafifixatikuj.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6887612c---34426304232.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/rodurinelomimunukoda.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/66991111998.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/55773230125.pdfIn PDF document text
    • https://airshow-bg.com/file/kisosajakixizavos.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082f200b01a7---88076278111.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a444b3fc---pabikeposulazetimedida.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/1064374574.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/dugozebifonugelasijowuj.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de238b551---99780179186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+measure+your+ear+gauge+sizePDF link annotation
    • 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_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 17004 bytes
SHA-256: b84c8ee5cdb1d8f88aa70c733852e41f58d92cdcef47564d43a526be7a89723c
font_01_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 10652 bytes
SHA-256: f5cfdc7b2c8272e993ebaf55f6ea96a6b7ccec3df9eb955e381840ab8e085a39
font_02_sfnt_off0001391f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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