Malicious PDF — malware analysis report

Static analysis result for SHA-256 de72d34bf38aaef0…

MALICIOUS

PDF

87.3 KB Created: 2021-07-18 23:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33d1420b475677f26adae6e4f69de1e6 SHA-1: a6f00a05e4ddb1ee1722687c4a128cada43b64b6 SHA-256: de72d34bf38aaef073aab7dfe5f3a4174dcb7977dc0a8dbe7605f196669499fe
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29e8825b7---98075307695.pdf
    • http://kiavysocina.cz/UserFiles/File/kufabor.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e005c10ba---zasomorovusezubabesukud.pdf
    • https://brianhigbielaw.com/UserFiles/file/15434236829.pdf
    • https://shidoremicrosys.com/media/69607223672.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfu0mfq0or2o50mkns7f2oguh0/38011703862.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m0nbk6jp9826uofnkviba5th8e/pobomisazarisajuno.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c206fdae67---tubibavagijepe.pdf
    • https://vannordenvastgoed.nl/userfiles/file/nupali.pdf
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/58681737221.pdf
    • http://sns-russia.ru/userfiles/file/63363833257.pdf
    • https://imotrading.com/images/userfiles/vunaguxuwumozusodagewe.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/327d79b4e1ae4e709329324da5b4ec24/62071460042.pdf
    • http://tcihk.com/userfiles/87719691812.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf107c253---luforigetinatoboben.pdf
    • https://marosme.ro/hirek/file/97784222435.pdf
    • http://vamaconsulting.sk/userfiles/file/97199946603.pdf
    • http://dichvutot99.com/webroot/img/files/bupowidadodobituluxukitef.pdf
    • http://wagnerpc.com/userfiles/files/jopipubegakonix.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/i1jjcmf5nq7i56em3o0b6l0r61/6086515692.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/36e2124bd41e3a96d80da69225357de2/zunife.pdf
    • https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=conversion+mm+to+in
    • 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_off0000f299.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 16792 bytes
font_01_sfnt_off00010aab.bin
a136c563bd266ed0d711fa01fd7e35b08f4c959799910da6e60d35b64892612c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 17508 bytes
font_02_sfnt_off00013812.bin
f92ba0018016daa032d98e7b2c1f9f44da92349f17cb79341093e43842b43f2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13812 10160 bytes