Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcb91959975ed64…

MALICIOUS

PDF

70.3 KB Created: 2021-10-04 01:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2ec731e300650d0df96f59c627cbee15 SHA-1: c539614c3498f29d9d6e91140633c6a0e68d863f SHA-256: ddcb91959975ed647d2b2357d5588ef975324030e273b7e76fc14941c3da5d1f
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ilkconstruction.com/Images/Media/files/12790911024.pdf In PDF document text
    • https://nationalshield-uae.com/userfiles/files/zedavopefevanofusuwujex.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/nenegujojusaleki.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/tiwuzedikobim.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/85994353313.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210922162819.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/beluxorevogo.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/dokigafuzutipaluzi.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/39183054693.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf3935975d---zelukup.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434bc08408e---wevedawuboril.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/59231499560.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/buzume.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/97812464597.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/411a8e6a39ec28c57002b5aabce14464/77321958557.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/tubejerirubotudetevol.pdfIn PDF document text
    • http://ihdbd.org/upload/files/93458908167.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/13913709525.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/67311655885.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/39624108362.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9e8aa9891d126e49cec86dcc9ec155c4/gezalesexufifosedagape.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a0cade55c---58537010413.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/5450959820.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/wejulorilune.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/11300208352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=do+snails+lay+eggs+or+give+birthPDF 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_off0000b4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B9 15068 bytes
SHA-256: 862739ff90a34629b7165050e5aea8ebd59ea7cc41bd6f0f104b342b0cc309c0
font_01_sfnt_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10708 bytes
SHA-256: e408ca8e65a9d17b63b1708b965d440f9f890c905e7dfbfaf01577f4f5967d60