Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a6285bb526daea…

MALICIOUS

PDF

110.2 KB Created: 2021-06-30 01:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c732a22207554a1a164a297e1916708a SHA-1: 9b11bc967c33e9b2a0370977045a2c624fbb1a48 SHA-256: a6a6285bb526daea2001a39528050b336dfc521ec06aa2cc288a235878e1ae69
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. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to exploit user trust or search engine rankings to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://drafthe.ru/uplcv?utm_term=position+and+order+of+adjectives PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5df2580f---bakidajinowasepakowewes.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c94e6b16---zivolaxenulad.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6e25a3eb0891bdf109c3830f4e969fff/zedaxuvusizodevij.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d5e5d207---72351944357.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/guravemar.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/6071818617.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/66098017847.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/10786078726.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/wesusetes.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae56429261d---5481561559.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d0614607d431b6a159b0dc1cd8fd88b/nutix.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aed40c2ee---juwifiwekir.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uvk5sd5jhfle60q8m0i0derarg/mujezafiwoxob.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e16fdab07---95569074010.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d033577f---rafuwikipuwodorilibokifi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e77e17aca---49139766637.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f172e151c---nebimi.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/gadelotuzusejozometilit.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf9f3d408---76062190471.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ahtskvjgb2i1mvnu3jum9tjk90/20703198425.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/27b33f8c438d64a6c85563a30de20339/zuganunojidobil.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d930f6a346a---nafififiwosoxanadapetad.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7d33a4ef1ac48d2295585f7427f0afb2/20079431020.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/95856846960.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 10620 bytes
SHA-256: 381915d169e465956441160fd1004fcc01a606c9d0dd0dfd38b12c6aac016105
font_01_sfnt_off00014665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14665 16188 bytes
SHA-256: 9d3a2c7f3cd7a845e425e22361150ca611a6b467aecbf2e15da520c4e09760d6
font_02_sfnt_off00015c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C16 20556 bytes
SHA-256: d1a4c8b7fb4be0bb3f0abeb15962fde00f851ce6fa36f98458a074468b9cc563
font_03_sfnt_off00019154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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