Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6d7aff635c99c1…

MALICIOUS

PDF

77.2 KB Created: 2021-06-11 06:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6eccb1d5c55eb841f5cd673fc0626de7 SHA-1: fa800d65818c6b07c46f8a6e5a05350c9478e73b SHA-256: ab6d7aff635c99c10a54be824b76d499778014153a64d275bce01b70218c9984
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the extensive use of external links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=minecraft+granny+horror+game
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160897154054a4---viralej.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2vg4d9mugnhjia8nnehcqarps2/42256392588.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde48915ed---59488236384.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765ded450e8---866573152.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0be4a10b3d---zugiditenomiwu.pdf
    • http://omonetach.pl/foto/ilustracje/file/59243329129.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c86d2d8209---50343081893.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe0dc8a622---20809837818.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc203785987086df2882a86935606047/58220158858.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d88c53c1a478fc9dd2700b74eba54114/selatizevezagujoragejo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513d7c57de---xoguxaruveresesefewokigo.pdf
    • http://canxetaidientu.com/images/file/fademipipujibesusowexa.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/begirov.pdf
    • http://lapenya.cat/imgjovesnaves/file/54742383587.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59b38992b---27641118776.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2eb2b1c77---zuvakurenusufuwami.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a5.bin
716c1e45b3425b6d7e9e37f198a1082b9a61bde8c56d9993809d5b527999ae62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 5192 bytes
font_01_sfnt_off00010440.bin
2fa8bd1b8d4079e158fa5954cb9dc3f3f442411ced89c711c69d90a403cf1572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 9996 bytes

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