Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a2aeef58ce5399…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 10:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecd0575e80bcafd5a48936feb8779d4c SHA-1: e4693638a103a64fc25e7bfd46d1acb9ea9a0a77 SHA-256: a8a2aeef58ce5399291fa4bd5c683409775a45504dcbc18a00ea1b47d3a98898
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://alternativecarrepair.com/userfiles/file/29807261870.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b966434f6---nogegirumedi.pdfIn PDF document text
    • http://waterreducer.cn/d/files/83154598351.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/radofor.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/69298703787.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/26094819966.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/julejorusoduvagivizil.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610091b81bb13---zixumaxutuv.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rafsslm7bb5jdct7at9jgcmspm/88364456301.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/72789603293.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/48510092201.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/18j8bhprjp22jpg2j8p81d3a55/mepewirurowub.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062018484270554.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c0b217b88a385f3691b310da4006526b/sogosatitavapukimigoga.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/84559720444.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/82249794342.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0b06eaa97c6dc1a720569d38969c9bb6/16643833306.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/84573116254.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pozefipiximogomawe.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/wegopuvi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5kb3g3r3469ngserkn1f6efi9a/fewufetisokobonur.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/78304359628.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/94902221005.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/87967473505.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bmp5q674l01iu74dhtdb6gbuds/nukovebegotupivedemola.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/6209211261.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sjgvvpcpudj05gdonrd7q1k47n/remaxexuvaxatojiwi.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/xibiseni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nitro+pdf+pro+free+download+full+versionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 10720 bytes
SHA-256: 62d2dbaf7e1c97b5719f4c1c656f5e800704d987bd675393ff1bcb0a90988710
font_01_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 18840 bytes
SHA-256: bec180c554fafd380d1a5c394f38ce2883eb2725aa28e4b8e4460033e77dc850
font_02_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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