Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ac7c10479b51ef…

MALICIOUS

PDF

75.5 KB Created: 2021-07-02 21:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 608a517e7e452f7d77a820240398b5fe SHA-1: 5ec8e487a78c30c9fafd0aa2f7d6ea8c9607af15 SHA-256: b1ac7c10479b51efb94edbde3d6f8921df64bf38e6198b41d88ff8fd2ee8a3ae
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://guides2alpes.fr/uploads/file/85024624747.pdf In PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/7c499efee0644314dd09e8cfef2ac68e/39420882202.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cccfa4b65---64241746957.pdfIn PDF document text
    • http://stroi-sistema.ru/img/jokunutifag.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/90538292345.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0384de2e91e7c3bcff230b2af412ff4/fixegimu.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/godurirug.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf9c2cc66---13672510608.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/sasanumumod.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08a71174ef---fifurupadaxoxorimuta.pdfIn PDF document text
    • http://nfc.soo.jp/file/rimufo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e366adf72f---56606982017.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2234bbad3---24300144011.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/vewemilajetuworoditudal.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/04645b7c0b4107796caff2c8218bd324/sokarafewifesuwemelowi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/pb6hm32dddafb2kg504e67mfck/28362773820.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/14085899391.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/56407862945.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7679675da1---pedotoxuw.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa9d8badd---37915963378.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/61fb66c563689a93b75d87473c717906/miwel.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210620041749765271237.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/jokegene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=driver+knowledge+test+answersPDF 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_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 10668 bytes
SHA-256: 2b05c4b52b1c45ac9e74864161ee24c734173abb6b2b42219a1fdb162bfe7512
font_01_sfnt_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 17036 bytes
SHA-256: bb3e02c309be56c7ad85a5cd5912c349de10b56f70125067dfc747dcecfcd10a
font_02_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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