Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fa14b3ba6a9811…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 21:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3655b290ac69fb537181684c41a4337a SHA-1: c23d7d92cf3f401be343d7607e2dbcbab200e444 SHA-256: 87fa14b3ba6a981134179d282c07e492422d4a7d1062c61ad769e058ed5a9961
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://lamgi.pl/ckfinder/userfiles/files/vebomomoruleluzezav.pdf In PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/sufura.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/pamunurasisovisew.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/6089373185.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210905094832.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zesedizorizejurexob.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/xorumenexelitiwane.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137046051919---xavarelawusomekobuwoko.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/43352404464.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/gububumuwigofixekotivor.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/vidiwoso.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/25005528459.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/59674362972.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/naziditagijoxixil.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424188567ec---marikekotesafo.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/34046402386.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/vusuzawejewomuzabaxodatul.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/zumexafedovaridelifejofu.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/vamanawegimetiw.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/fnuhugbq9jtpm8imij0vrjide0/51335993650.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/xokaviwatumateti.pdfIn PDF document text
    • https://wrd13.com/force/file/darizetome.pdfIn PDF document text
    • http://minerva-collection.net/files/files/91501399838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+go+mod+apk+with+joystickPDF 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_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 17628 bytes
SHA-256: ca48f837e72f63a73fa405d859d8eb28b6fa6038d0b95526f2113210be9277b9
font_01_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 11240 bytes
SHA-256: af1aba5a9eed55c9bfa9258d1bf1ed1c81561cb042cd69cf8e22f2ca5408fb02
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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