Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5e8e4d35b79333…

MALICIOUS

PDF

86.7 KB Created: 2021-09-12 17:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b974768edfebf8ffd876ea7bf1daebb SHA-1: b9b7922931204c35b0b8bc4b00767824f35448c6 SHA-256: 7b5e8e4d35b793332c5b3de4f1284f71a4989233f4da1bdb0dbaece414175ad7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to unknown or potentially compromised websites, indicating a link farm designed to lure users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The file's structure and the nature of the URLs suggest it is part of a phishing campaign or a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/n23pr5sdjmd5irht07mm9rsgeh/44453882308.pdf In PDF document text
    • https://carcable-bg.com/uploads/pictures/files/satixijon.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/gebilukadiripibulalujudu.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/dalewekapuxawol.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/48429040964.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/saxuxe.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/46601509597.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/popemapizuvoropurago.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/jixebusorivawawuluzewi.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/siluzin.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1a12759be7fe1a920a734dced6b4a757/gesasizoxaki.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/43521367007.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/98083702294.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/mujajenutewowujirafozetu.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/77130341582.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zagawonuradigenojubikukev.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/tipob.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613641610285a---64680146798.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vivogagagigolezokumeke.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/sowododuwebivow.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/kuvilevur.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7220e47f---jujumonofatusepebiruv.pdfIn PDF document text
    • https://fultoys.com/userfiles/46149953722.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/49318576850.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/16038312492.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/14442588265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=comparison+bar+graphPDF 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_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 10596 bytes
SHA-256: a437d85da682f30a2ca3015466e1712fcc5bb60ec78c7f319665daf8a8073c07
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 17592 bytes
SHA-256: da497ef8b0b84ecfc8d51bdb6e87e62b51ca8ddc05fec5ddddc66a175d3da9d4

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