Malicious PDF — malware analysis report

Static analysis result for SHA-256 71564ea018885320…

MALICIOUS

PDF

94.0 KB Created: 2021-06-25 17:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddc5b6642703e3556de8cf9bec881124 SHA-1: 43ca035164b4440e08ee1392e8d2e06d8310cecd SHA-256: 71564ea0188853206a8711d6eab4afc8cd3ec794be512ad61050643ef1463299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple URLs hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087230f38f28---38620180219.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7uug416sn5f554j4ac94b67ec6/laruzetevuwesuterazoza.pdf
    • http://alumcity.ru/userfiles/file/34919988284.pdf
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/36698367095.pdf
    • http://yaqeen-eg.com/userfiles/file/divexudixugo.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0gvpie26sjaa44vbfvq6a21atg/fotisosexanubibezap.pdf
    • http://coiffurenais.com/userfiles/file/93359919394.pdf
    • https://ourlady-schools2.com/userfiles/files/45759066290.pdf
    • http://sowa-architekci.pl/userfiles/files/41102221028.pdf
    • http://engroupe.ca/aym_image/files/folivapekukonufavizok.pdf
    • https://alshaabcoop.com/userfiles/file/nigoli.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70893e5e50---fujobuxizojatejo.pdf
    • http://salukool.ee/upload/userfiles/file/60627322693.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe56330c26---zovonusilodelifomofumokug.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5f375b057ddac6a505ce78112fa3a1e8/3948583283.pdf
    • https://aucordechasse.fr/vosImages/judewedabu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=305+hp+to+kw
    • 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_off00010e3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 16792 bytes
font_01_sfnt_off00012654.bin
b5a8a5ea78b46c2b519153afc5b44f18547a86681db01cfaf42c5f87a07c2bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 10052 bytes
font_02_sfnt_off00013cd6.bin
9cfcc1320fab88aa69bb483ee015fbf8ebad5307f42e92d504415a2445cdd6d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD6 17620 bytes

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