Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c707e2a9e3d61f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 10:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68e79e8cc664654b67761f13576bfc78 SHA-1: a560205c2463e7a06fb4012fc2acb0b819500d39 SHA-256: f0c707e2a9e3d61fa7fa05c8423222764837dc23361f1afef9819346020252e7
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=electrical+wiring+book+in+urdu+pdf+download PDF link annotation
    • https://timjanen.se/anvandarbilder/53/files/lubimowuj.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607daacd0d713---89051998313.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/temanopozavureterusesik.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/67771918385.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/zemovabelolewabamezokok.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/83618589957.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c64a6c5e---43836448817.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/wujurajuvemazabe.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021080205341373499.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/52560793376.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/798660a1972dc659a365c0624c79cac1/47632935300.pdfIn PDF document text
    • https://zold-kommando.hu/files/rigitejizajodakod.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/vorunego.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/rabudawivujimit.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/durm2ag7phlvatg7ntlr1rsul0/29043348643.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/60206079638.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37374071456.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c188eb56e5d---puferegipa.pdfIn PDF document text
    • http://teresachild.com/upload/files/sixumavemasesapidap.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h12fi84vb9puk0plf9t8mc7hbt/zomodogeje.pdfIn PDF document text
    • https://tavio.ru/files/file/megaves.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/tekigajodobeguwov.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/topuferumasam.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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 11028 bytes
SHA-256: 54e67b841a4589b6c5467810f9edd51f2a2936ecc2e4cd77974f221e16a00f6d
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 18524 bytes
SHA-256: 64f1f0ca346eaa76f816285ad5e72c3b00a6e151c14e00493593e6b1bbeb646a
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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