Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c183ab3646307c3…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 10:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8d57d9b79775c7cc2c3e3947b409f59 SHA-1: 3402e4b004d380dc96e67956e0e0d4ed536dc19a SHA-256: 6c183ab3646307c342e6f872592c1c9080797492505216879287b7a9f76abe95
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The critical finding is the 'SE_CLIPBOARD_COMMAND_LURE' heuristic, indicating the document instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious payloads. The numerous embedded URLs, many pointing to compromised CMS uploads, suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/20f83cd9bf3abbbe68ce5366cec7efe6/90174812417.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/duvofemixiwogizajagizidap.pdf
    • http://aklond.com/UploadFilesfile///2021050423102431.pdf
    • http://alnadaoil.com/userfiles/file/68625218868.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3497360428---falizifut.pdf
    • http://www.euro-fly.eu/userfiles/files/46668585890.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c896c6d26be---nanezebozaxopujebajen.pdf
    • https://artenika.pl/fck/file/xizivekiromazigimodumujat.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/51lusg9ak30a4hqhjch57j1nqe/85428736737.pdf
    • http://sbnjl.com/userfiles/files/tonibudez.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/zavoxuvalunovesapu.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9c6a31d6---jadexaxi.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d93e592d0---fafumupigivomezukafek.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3fe23aee6a2d50e28f2f75ee70b97a4a/40155595157.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160996cb78bc13---piwokuxumedovimigoz.pdf
    • http://andreaslasnik.com/data/files/76166640483.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160964ae4f1e6f---45570750402.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/cfc1bcb0b798e9c8e17fb2238256a36b/43382843034.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082a088e298c---39248921641.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/68224348565.pdf
    • https://zold-kommando.hu/files/16709395895.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c4eedead8ecca87793708be78a432069/wunik.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b35598a4fef8f4008fa07db9ca944691/3293619403.pdf
    • https://medtek.vn/storage/file/3946466839.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=put+multiple+images+into+one+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61e.bin
1cfb186c8c0b7a63b0627ae1446cf669b87f884534104432de4afc564cff835b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 10840 bytes
font_01_sfnt_off0000fee6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 16792 bytes
font_02_sfnt_off000116f8.bin
6313d6bdf82c36d5574b1faa2a0099ba447cde6f2a13f801f63312e3d3aa7f59
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 17808 bytes