Malicious PDF — malware analysis report

Static analysis result for SHA-256 53af0c7abb2b7513…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 17:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 798c6e852946741fb4c59837df65d09b SHA-1: d74c5fc082e3a001b39fd773b6b2b8bf37fc4d5e SHA-256: 53af0c7abb2b751338a76840c4c042464ffcf6e73cb2a73c5098a8b58ac9c3c8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to trick users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae4cb229f---zupomuduvegalo.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3f60f166---sizuriwuvoxibuvakazedove.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/8vt1lp31n5t2719b6kj3kov2t5/97005447702.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210529034621.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nipidelepetofe.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa8af1eae---59996763604.pdf
    • https://escaletravel.com/userfiles/files/39671262710.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6d2a4bf9---luginarokilona.pdf
    • http://doks-films.com/pcms/content/file/kigoxalufe.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe12bbc016---63262245304.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cce8a094d848232bb267d1b2ef3b12b5/12294843348.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad12234e5---42304773283.pdf
    • http://giftboxvietthuy.com/upload/ck/files/lixirejedemipegabamejir.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d9d2a47199244ed0d61ef9d28e1afea3/lojotaloviwoz.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ccfa1d7113302080eab9ebda2e4c1fc0/dotomodemubeziwexovaji.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/034e16cde878754eab4cf44c5ae8e27b/3744597459.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9fba3fab4---76509938071.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8b2e7b68---91479939620.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e259c8f48e122ae53d5a77f297157791/6261762938.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca640460b---31647310360.pdf
    • http://bpsstudio.hu/uploads/ravutuvilorari.pdf
    • http://a-kamen.com/userfiles/file/bilivegewapawagudo.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a17f4c928b76db22f3cb8940a61ab695/52754571436.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ea44fb4f---xiwobotawufixuxipav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=perfect+round+boobs
    • 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_off000102eb.bin
66d432fbfedb8e14f6e8f6b69f8dc4438c20ddf4cbb904f9c7efa6c21be92b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 17084 bytes
font_01_sfnt_off00012f67.bin
0c0cfc874bd88008a1d1172ecb2f0aa2b4dd52a4951f02709772e1f2c4033fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 10412 bytes
font_02_sfnt_off00014726.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14726 16792 bytes

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