Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87bb352d865dd3d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 10:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 682d354a1c46b8eccde1b554fe68130a SHA-1: 72e51099d666b17f7ad58fe21e3fdd1171450f30 SHA-256: a87bb352d865dd3d4f9bbf1b5c6160b28a65fff5f27d0d7f1636782ed6411626
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to direct users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=samsung+galaxy+keyboard+settings PDF link annotation
    • https://ehbo-oostkapelle.nl/userfiles/file/16955041600.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/tawire.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/mowiguloxurukujikexenub.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d1831b1c6---5180381473.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/60061718242.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/77412300414.pdfIn PDF document text
    • https://andrejc.si/files/file/87438893944.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/31999708504.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/gopugubabij.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/t66tk5lct5otkqj71ms3ngola2/37403342961.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/gabed.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/fesadezelowusedevib.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/52019325982.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210902044758949501yee4cnngz491.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/d1uspacaimrg1hl61rnq8v9p05/xijigufatuxifajado.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ea516dafa78a7efd2be616ffbee4462f/fuxijipigipajefenanoneko.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/59927945422.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1838933748613e6eef7047c.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/povakizaxat.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/26194013573.pdfIn PDF document text
    • https://506hlapeta.com/files/file/20689421361.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/57954665008.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/89045182892.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/nisuf.pdfIn PDF document text
    • 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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 11216 bytes
SHA-256: 8511b66a4dc3711798ea00520bbc0ae1bf30268784aa5eec2a4cd858f5da0b9c
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 16760 bytes
SHA-256: 920d9331976df28ae929e88a0dd8f898b0f2913aa11d9fbdb5f684fcd0cc1b8d
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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