Malicious PDF — malware analysis report

Static analysis result for SHA-256 707ad3c53cc4fe0d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 23:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f16de5e964b5e83be68ba24b18733dd9 SHA-1: 05d13af55bc595807a4ae30f138396a0aa62ab2a SHA-256: 707ad3c53cc4fe0d904a7bd41178ef94cd564c88d3700913d21c976169c795a3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish for credentials. The embedded URLs, while some are confirmed benign, are part of a broader pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i3f5nljgjtjs4a52cblkj2ccak/96737846489.pdf
    • http://aotwcasino.com/ckfinder/userfiles/files/seminomijujaxidixuvomek.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/woxusitotiketatenemoja.pdf
    • https://mmgrowersg.com/ckfinder/userfiles/files/disipu.pdf
    • http://eurekaelearning.com/upload/news/file/lutinuxolosoniv.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5729a494---magakep.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/zuwanef.pdf
    • http://printsolutions.printsolutions.bg/uploads/wysiwyg/files/mewos.pdf
    • http://sungwoo-n.com/userfiles/file/gedage.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/99141294200.pdf
    • http://dep14kirov.ru/userfiles/file/nunaxaxerakatovagobo.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/29249649958.pdf
    • http://master-stroi76.ru/userfiles/file/vikusipu.pdf
    • http://medicom.pl/userfiles/file/lesujabopapaluwakavivo.pdf
    • http://mexxeopaint.com/upload/files/teket.pdf
    • http://roomyab.ir/basefile/roomyabir/files/kimidokamuvumugafizilikib.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b245eed369---3840163452.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/69795667144.pdf
    • http://fertilityupdates.com/userfiles/files/85747543571.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/09b0df96d877339ed01d0e0d51992166/jivovilaj.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/sugimejaxerabijuboredajef.pdf
    • http://roomyab.ir/basefile/roomyabir/files/16554135391.pdf
    • https://inprovitargentina.com/ckfinder/userfiles/files/juxuma.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+y+el+prisionero+de+azkaban+libro+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79f.bin
82c7c6194f93148987d02b92cc2877f097675e7566949f602d53522fdb5cce21
pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 10888 bytes
font_01_sfnt_off0000f0b5.bin
e0968dedc042f3de996027c9c25d47e860f59eb0f2b078df4dc4db36fd7f9954
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 19560 bytes
font_02_sfnt_off0001227a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 16792 bytes