Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01dd2c3904f2d11…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 01:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 223e3fd69471b5d908be37626c142a29 SHA-1: 0e75b82ad4833b940c5f0b63176659b925266f3c SHA-256: f01dd2c3904f2d11fe358c6a8c45bf0550e4ea808e810aac327b2c51d168dbfc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of external URIs and links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=nightmare+in+the+dark+neo+geo+rom
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161416accbb39a---91836062599.pdf
    • http://ranch.pl/files/file/jizekuwasemivaboxoxediju.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/17/noralid.pdf
    • http://matras-devison.ru/upload/file/tosanikikipabifowazo.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b7d34a6b095e8f39bb71ddf6e0f84d11/61079860399.pdf
    • https://zerling.eu/nico/images/files/fomukuwu.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/966b9e5f3ab08266025b44f3b09cd78c/68090637463.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gprsle3968q3nl7geapurkgi65/90119565048.pdf
    • https://atasuorganiktarim.com/upload/ckfinder/files/64589875592.pdf
    • http://nhuaduongnhapkhauaz.info/upload/files/fadabuf.pdf
    • https://gotoko.com/cmsv2/upload/files/77253015363.pdf
    • http://njchemland.com/upload/files/51911043400.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376845ab042---19605203576.pdf
    • https://biharlokmanch.org/userfiles/file/51587721455.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/jajegaziforiboju.pdf
    • https://cukimentescukraszda.hu/files/files/46166762986.pdf
    • http://creationart.hu/files/file/finasutukunimofufikoxu.pdf
    • http://uktohabbarijamalta.com/files/file/90104151554.pdf
    • http://geomanteia.com/userfiles/files/lefekofetegaxijemexuv.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90a469ada---50644589475.pdf
    • https://warungmimpishio2.com/contents/files/pakarimulo.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b68e1a9e---maxes.pdf
    • https://atcotourismtravel.com/userfiles/file/80207331491.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d36116647---nusalexaj.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_off0000c448.bin
830105d4abed10057cb6cc2bb0b4af1e98543876f23094c6dceadf2d20784c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 17672 bytes
font_01_sfnt_off0000f2ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 16792 bytes
font_02_sfnt_off00010ac5.bin
f5c4dc6c74213825317880cd874417917067085f2c76f34a1e942a7f02170079
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 10548 bytes