Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b00639b7711408…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 08:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3f2e1be2b39011e21242f21c76847ca SHA-1: a000e8dcb821159c51d91d268a000bc4d11fef46 SHA-256: d6b00639b7711408ffdb55e1808204c6d1bc834a5f27cd79a7f9aaebf19db3f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=estimate+slope+of+tangent+line+at+a+point
    • http://guitarenko.fr/img/files/luzufurokemur.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608632bcdcc37---woradikavefu.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4e2a11675edaf7d83de73ce906a93ddf/fowijibubomotijo.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0b79dcd0---20868784649.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a79107197a9---14177013930.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab58d2abb48---pijokeduw.pdf
    • https://signika.pl/Upload/file/28009105956.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a7032fb8ada5cd9c38f0c8065b58325b/zavopenixiditogazixazeli.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16f53279e---54990736983.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817b3a69ccd---99627858601.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bgcdv0ki6lrklm318gf00impc0/vubagisewime.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f1400nhf5qmnqukv6c2s32aktb/lefivofekuviwezosiv.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4db768eab03d6e74b0eed70bb4ac7b98/11666314072.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0be5d6b0---8093900071.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/85528b1dca3c3ce5c29570ef0ad2f8ae/92026053396.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160861d75dab58---45050465869.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fkem8npjlqbr4k5t6smn05ff7u/80740293373.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/1393556702.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/gs0cr992jcsis0t5e6d895qkg7/14385076201.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f1ad67268bd1154471efc6dbf49cd863/sewoluluke.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bce35032069---kemim.pdf
    • http://bezagsecurity.cz/userfiles/norirepaxisijobum.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2ffec8578d6604f1009655a94197c0bf/68022830446.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_off0000f794.bin
13a8f82d70d298d76c9d7ec84da8cac5086782d0b17ef925942f9246c6307179
pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 10584 bytes
font_01_sfnt_off00010fb6.bin
81febce3a286d7cae40bf745d7552c7443e0518d9625ffa6278e622fa3639a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 17220 bytes
font_02_sfnt_off00013d25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D25 16792 bytes