Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db8a9725385ca38…

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 19:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c96375184ac52750cbb71608b203f28c SHA-1: c2fe829a300860bc180a308a3bd85969dbaea956 SHA-256: 7db8a9725385ca388b242883edb758998d269f2ab002187d5e8b34f4fd066ea8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's used to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=mystery+dungeon+2 PDF link annotation
    • http://ore-processing.ru/d/files/67555401450.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/xulazerebawedodalosagu.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vadotalifi.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/54971212325.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614217c72d3c7---57621388127.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/pibipavozatubizawikuxik.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/pidenapuxuxobujimebolaxi.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/wikeguxopuguxawi.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/65084542422.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/5161892157.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/72507945524.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/sejexodanurajaxu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9edb3967---tobenew.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/34786423675.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/88501254167.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeraberabipavulaxe.pdfIn PDF document text
    • http://vce34.ru/attachments/file/nanir.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae472a78ba---11950055095.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cad50e70e---nivexudebagew.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/ketixorewujijizexizepo.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/fexiwavuxojoporaxoju.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/41727792494.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/68491015914.pdfIn PDF document text
    • http://erimti.com/userfiles/file/buxirexixogadojomexu.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/zototefibedinag.pdfIn PDF document text
    • 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_off0000ba63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA63 18156 bytes
SHA-256: 8d17afb09410dd37bfae6eb528bc74631187e5961cf9eb736013e1960a048dd6
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10452 bytes
SHA-256: 927c51eb4516252ce45d91dbc8b695ddddb1c3e622de3e0b06c5500c5aee04f4
font_02_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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