Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acc7cfa319aacb0…

MALICIOUS

PDF

141.0 KB Created: 2021-07-20 12:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cac1be527a121dd4cb1cb68ab431aee SHA-1: ef8e06a744190fd8a6f5aaab858802956670a8ba SHA-256: 7acc7cfa319aacb0ad297557de451a2a8107c1168ab32931bee93b6add7679a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malware downloads. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://ekotronic.eu/files/file/2245213541.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607818f35ab1b---20145118554.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a731f285fa2---41529316688.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3db2e2517caf9f4d41052f17485fff55/xorijexixe.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e1bded6107b2467afe11545654e61566/18184561854.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607179a8452e1---1774678550.pdf
    • http://ilovechardonnayhills.com/userimages/pofowotesu.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/50181898144.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/v39d29nn14gk0decgntirtd0sb/karuxivomefis.pdf
    • http://gmei.lt/ckfinder/userfiles/files/gofinejavezorufeb.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b084649b27d---jevajafi.pdf
    • http://capesociety.ca/uploads/files/xijopuwadenaxiwo.pdf
    • http://crescentcarpets.com/userfiles/file/kukizunobavivedaw.pdf
    • http://nhs1980alumni.com/clients/878257/File/8510308980.pdf
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/41200498351.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/to232t5vkll55cbjgdb0h93me9/32099653846.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cce4eeb66---kunanikanosukimetak.pdf
    • http://simonide.org/userfiles/file/nurerurufuged.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee740b851c---63027527155.pdf
    • http://www.predia.cz/userfiles/file/rinavofolat.pdf
    • http://www.medicellbank.com/userfiles/files/59252277135.pdf
    • http://bhhangkhong.com/upload/images/files/gujidoz.pdf
    • http://exito-opakowania.pl/userfiles/file/91063432223.pdf
    • http://crmloccitanecr.com/campannas/file/3086468262.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+organic+compounds+which+are+isomeric+with+one+another+are
    • 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_off0001c496.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C496 16792 bytes
font_01_sfnt_off0001dca8.bin
ab57592d2af5587ad52a486fbeb5b5f58fa0d196c819b9390b511987feeaf9b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCA8 18192 bytes
font_02_sfnt_off00020c38.bin
fcc0165c6db373dc5dc75d2c0131da948f868aa5463761acde9b662dff3aea67
pdf-font-stream PDF embedded font (sfnt) at offset 0x20C38 11064 bytes