Malicious PDF — malware analysis report

Static analysis result for SHA-256 4369c6db17bd0784…

MALICIOUS

PDF

73.7 KB Created: 2021-09-11 02:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ff3d4e07cf3cec8d43da179b844bc13 SHA-1: 01ea488b8e4fe176715038a0bc8c2aa813ceb235 SHA-256: 4369c6db17bd0784761c5490f39ef137281c6d0f0f945d77a9fbbd0f8082b467
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains a link farm pointing to numerous disposable domains and compromised CMS uploads, suggesting an attempt to obscure the ultimate destination of the malicious payload. While no scripts were directly extracted, the nature of the link farm and the detection as a trojan implies the PDF is designed to lure users into downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://biocoils.com/img/file/tidejuladowesewoketug.pdf In PDF document text
    • https://paymentor.nl/uploads/file/3126254904.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/75438254781.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/tosewixibusonetag.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/jusojegegejuk.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/12859962254.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2d0de918b---japulitumejifimotules.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a0e228e8---wetufariluluzaramosikalax.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1fbd285ac9df72e16fc2d50ad3c06d9/libuvawewusotupuwekorigov.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b09743bf5b---gazenovumew.pdfIn PDF document text
    • http://hijoin.hu/editor_up/98582741579.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/lozumorodoxonizusoliweg.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/fanizojekaluro.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/pugisimojojalirewok.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109030653407624.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/pafudesuse.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388df2a1698---55527776724.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/37708614420.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/10157621255.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/luminasetapunabofomub.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/57843000311.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/zidunuzador.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/nujagadojupibozolitaz.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/vakibojuxitefomaguduwif.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/52368156476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lego+city+my+city+1+apkPDF 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_off0000b650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 19472 bytes
SHA-256: f6ef721d3a81fec0658775965dbb9c0e67b7e8fa7d28810eef807e61df8dd9ab
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 10512 bytes
SHA-256: 9b21501b721c2d6a418e27706c8f5d5cd1436ef921edc75d80b3cebfc064a2c1

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