Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0910088a17daa0c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 22:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23887df8073ebc3b7c91da976ebbc1f5 SHA-1: 86fc32b236e1f03b0b632e28e1f866a9894dbd32 SHA-256: c0910088a17daa0cbe17cd3cda0947ef4be020b8d48c62d69a3a73672cc7ecff
196 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gencshow.com/upload/ckfinder/files/zutevoxasizefagisinopebo.pdf In PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/dipofazimobiso.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133710c2ab8a---bifazukodi.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210905095905.pdfIn PDF document text
    • http://eko-uklid.com/files/file/49697265432.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/welimopavosusukatoz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/3244446146.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xafubovamakilejurotudekid.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/povowaxavijagisuwadigika.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/dimozezegizom.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89419251866.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xutafedazoxi.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/72589915558.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/70194803373.pdfIn PDF document text
    • https://akconta.com/uploads/files/94679973475.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kegifevametogasa.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/woziluz.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/velip.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/29173818700.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5u3p37cokd1vo8sdghuqrphsv3/korovinapom.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/20821971697.pdfIn PDF document text
    • http://wamer.org/userfiles/file/607526936.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/vazejoxikovabafajogunil.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/91790633801.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/760806f52426f37d27285b674593add4/dinijupamatoxalesidafez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+phone+screen+on+pcPDF 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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 17620 bytes
SHA-256: 653cf22749814e56138763f374aab9e0ebf83fcdb8af7859966b000578aaa56c
font_02_sfnt_off000131c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 10284 bytes
SHA-256: 8e8ef3929412a9f0fac31227cc5edc0b851894d88813201f0beca73303f3ba55

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