Malicious PDF — malware analysis report

Static analysis result for SHA-256 9526b992d9d01741…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 20:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48572fb144fd7a394f2c1ab83a39cd30 SHA-1: 8abfa8f0a990de91cf8fb738438f850a99c08534 SHA-256: 9526b992d9d017417098b67df2637966f293852d91a8dc2f4e1496533d1f29af
156 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. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely for SEO manipulation or to serve further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/xovav.pdf In PDF document text
    • http://hankyunget.net/userData/board/file/55987218867.pdfIn PDF document text
    • http://abnicum.com/files/file/guwifurenazebujuroj.pdfIn PDF document text
    • http://vce34.ru/attachments/file/14013368258.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/34685212633.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee7bf376a---femupojosutusu.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/14811384705.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/julajaxaxavilomifa.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/torufosavupapo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad712e8ef---53472028532.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/93148319180.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2febe7219dd30d8be9ac431528458826/36064967442.pdfIn PDF document text
    • http://anupbolivia.com/images/files/fukup.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/aeb29a8912a8d38db9afbb8c207e4d40/82288641425.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/fulotakijave.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/70887458993.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/tesapetatazebexapuxuru.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/7569107775.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6dc3341c---79314352352.pdfIn PDF document text
    • http://brmc.jp/user_data/userfiles/files/kolejaf.pdfIn PDF document text
    • https://soechi.id/userfiles/file/sobamijosuruvisaxo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ce17dfb9d8e---50851590875.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/72783686966.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/sepakukosuduwafogi.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/juvulizuroxo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h4aobmpegvi83jpd78dk3mvnv2/53429950688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=healthcare+policy+and+procedures+manual+samplesPDF 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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 10984 bytes
SHA-256: cc5b27f8a25a403a00e389969a029a9695e2a34b3af7a32eff12acd35685af66
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 16976 bytes
SHA-256: 88abcf67ee0ce0d5a8f9046e4b1e81613f6f7816d61c6fd716ef73ab3d3e01f9
font_02_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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