Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7fd63f27e43977…

MALICIOUS

PDF

91.1 KB Created: 2021-09-07 00:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5936bc777d7a4e4b919fee43530041f SHA-1: 1bda6c3f0d74f98c0c0f47efcbf678fbedc82d79 SHA-256: 7b7fd63f27e439770009927f51a45bf390917de8eada4ac8bb25fdf81387968a
196 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 heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social engineering tactic to prompt the user to install a fake browser update or extension, which is a common method for credential theft or malware delivery. The presence of numerous external URLs, many hosted on compromised CMS uploads or disposable domains, further supports the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.ecostroyservis.ru/File/bagifopatifiroj.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb4f03790b---32975919124.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uplpm51l7m7m049dp5r36tp121/87675029340.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nrd53tun9uqs7ecoqmgmmlf92i/2566589396.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/putajifovagarurubam.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160885b3a867fa---tavosafurutibexezut.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/i4i7ml14hrkf0b39jb87l1pg5l/lujixor.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/gifosukomuxarep.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/19960710843.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/79298433563.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210512065411925458330.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/03d3808e6f69b3aa380f10f330752e15/notafatipofotitozifav.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d41a260d---gusekojutakinav.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/11333315769.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/2639017404.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/juvaw.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/luse8a4bfmqgrnfq3ssabktrtp/wepalup.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/2a39d36a62ae38c84962e766f5d0c2f5/72259538707.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/a0046dab0f64de38c29a4e68a49dc72e/maxab.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/26883467252.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608084092f7b8---66597260931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=%D8%A8%D8%AD%D8%AB+%D8%B9%D9%86+%D8%A7%D9%84%D8%B7%D8%A7%D9%82%D8%A7%D8%AA+%D8%A7%D9%84%D9%85%D8%AA%D8%AC%D8%AF%D8%AF%D8%A9+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010064.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10064 24968 bytes
SHA-256: f1229957211c65b16a7030ba0fc25a65e09162da612abe57a2d8df3b2825428a
font_00_sfnt_off0000ce07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE07 18760 bytes
SHA-256: d5945b9faf9e18cab961b405b3c67d9632a85c9dabf38480002261ef51c4813f
font_01_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_03_sfnt_off00012bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 18832 bytes
SHA-256: ff700d71b4138230858de3ff916c7965dbae6456e6d58c0503357f3e4134f23b

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