Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f30c0fff555880f…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 07:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9251b29ff10a530e3c8d0909b6ca74d5 SHA-1: 73dbf56d58252baff990fe24d94bd7a9a2253eec SHA-256: 8f30c0fff555880fe72da77d46b78142fd5338eb99f48eb9ca0bf54b28529b0f
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Several heuristics indicate the presence of external URIs and links pointing to compromised CMS upload storage, suggesting an attempt to lure users to potentially malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific content or intent beyond being a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://ktmcollege.org/public_html/userfiles/file/50303254007.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088216ad13d6---93946410303.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/62ba3efd3a9120865e681a4f09751589/vupamegosekuj.pdf
    • http://modellszerviz.hu/userfiles/file/xasugaluwuvajutiket.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5a53f975ef5b70e0ebd5b396fcd7ab60/tiledigigofokafelifebab.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fdb8dfa6---xesasuwunexegolonuru.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/27f0f3bc18b0cfbc31ee89845bb3ab23/welemofimometene.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf21ce9a2bf---womoda.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160c777fc6eb27---levugazifujibexema.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710e7d83013---katutu.pdf
    • http://simkoongschool.com/uploads/editer/files/61895243640.pdf
    • http://brette-animation.com/userfiles/file/worimuwuperavubulinerawav.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd29852cc2---18621019138.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c87bb319---74310868249.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/f2451f1bf272ee69859373c9310c2a49/damefukanoxidolazezupi.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f2f7a77e5---vunalizomu.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e9da1e6fbb2d13bc2db4a43946485152/22555522864.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f029c3d59d---nugamimapujazibedono.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160760dfc27747---87289076605.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a410cf437e0---99609736194.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608f049e2d1b2---lokulemuriregafavoli.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/bc930b5a90889b278fa87710d2843efb/zexusowitejakan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=metal+bluster+2+game+download+for+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da09.bin
6acbb55fe17f82199b4b8636ca2bae2433c79b5b347d32eef1013b5f52849a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 17728 bytes
font_01_sfnt_off00010826.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
font_02_sfnt_off00012033.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 1692 bytes
font_03_sfnt_off0001283c.bin
4826c01d3bd7b81412689716e107ce0ec215da42d5b412461bb673e51390a637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 11136 bytes

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