Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf23aa0f1f1b02b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 01:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67651f7eb7cd81b6259bccebfee9a04c SHA-1: a2629ac8f8a948d43b8a307c909fd54cc8fcae5e SHA-256: bbf23aa0f1f1b02b4706f1bbe1cb3ebdd0059d81d0080f89b046be012904b080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://factorycontrolprojects.com/userfiles/file/tuzupek.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03f3d8121---60023101382.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eac400b82---67709877435.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16105193762ce0---gajujawij.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/92780044495.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/xaperutudaxosivaromozap.pdfIn PDF document text
    • http://umartravel.com/files/latemirigakimuwo.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/8292c44d393e8911538aa37d926bfb94/72258334241.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/8f4fab4138f3a614f2751506ceedef12/murejederoxunibazosil.pdfIn PDF document text
    • https://parkettworld.com/upload/files/tobuwi.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wawuluxezuduriwusipuboxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161041ebd1ff5a---32781475494.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/66056205102.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160867b095ef31---xofobisopi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611929687ae9e---88548025169.pdfIn PDF document text
    • http://baove24h.info/upload/files/bebaxo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/btl3dvtjm5k2m1esojfi2rma56/pefijod.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/daxurapatuvuposerevekonif.pdfIn PDF document text
    • http://dsraxys.com/uploads/66037345285.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d36dd237e6625f1bab50afb7b01639de/39845580318.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/welutebuxogogu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd13ba0d0f---97428237935.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/87584466351.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/kkithqbq7rlov50rdp4o4dhno3/loguvolafonejapadifevavem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=olympus+om10+fc+manual+adapterPDF 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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 11104 bytes
SHA-256: 3cb8bd626e97567b2b63b44a0d8aee990bfbae3b39cc56dbb7bd3e0b1f1445d0
font_01_sfnt_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 17584 bytes
SHA-256: 053e94659b0022850b0dc6f924a645be432bb92f1c5d1cf18e68307f39949a31

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