Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5d04bf6b5381bf…

MALICIOUS

PDF

137.4 KB Created: 2021-08-10 06:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: fe48cc4fae2eadffad20b299a6b1fc55 SHA-1: c3500ad2c875e258e74f884c54f859e51e80dc52 SHA-256: 9e5d04bf6b5381bf80cbdab55a87b6e5c2c897c2a53b4d68af5761ea6ff74fbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9694

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://www.buildonhope.org/file/36589280337.pdf In PDF document text
    • https://bbu.vn/Images_upload/files/bojuviduwirakokenomim.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/68900411908.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/wivutikokor.pdfIn PDF document text
    • http://kasargod.net/uploads/file/87646856518.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/69830428286.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/ac6764283b2583108b850014585e85d5/xilajonu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d8b49213dfa036daff37b7e82863de3f/guzojifisenegotujuvudixef.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/61047148064.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2799b14507d31247670325e358b40ebc/11806348394.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/uk2q3483fqers2i3tu7bq0nn1a/31650074591.pdfIn PDF document text
    • http://esistore.de/userfiles/file/pekadorasivo.pdfIn PDF document text
    • https://orangerun.re/photo/files/80995954591.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987c9def2f6---duxasalunarojokejuv.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/zunabix.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hcvfg819atgrv90gmskot5l67q/13010692246.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b8c3fa44---polixazimupinujefari.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f0b2210a25001ba7650936feecee4d15/navuvijojipebedilixukadol.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/65ec872e8c8014eb2a5f370ee66bada6/25979089625.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/65934106201.pdfIn PDF document text
    • http://matras-devison.com/upload/file/wubizapavigawifu.pdfIn PDF document text
    • http://htygroup.com/upload/files/2265116035.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/pawis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=genki+2+workbook+answers+keyPDF 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 2700 bytes
SHA-256: 1f43b8d57829b51ee208ebb363136a1f5195747344e944b964b34154a9caaf6d
font_01_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 17056 bytes
SHA-256: a24162bb3ae33521d330371251100f3b6dc434d37612af86dce0409a810f7376
font_02_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 66208 bytes
SHA-256: 248fd8c91d438b2766291a764e66a39d10dff5b2fb373a08bf909cfcb9a643d6
font_04_sfnt_off0001fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB92 10548 bytes
SHA-256: 81d0e25bd32ff3c26487bee471389ad7f999dea5b5ceed84fe22cf5fe79ff049

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