Malicious PDF — malware analysis report

Static analysis result for SHA-256 827554356a3ff6c4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 06:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f197094ae900c76d1c3af8a623ac1ec5 SHA-1: 4582612304f94d2660b1b2dcded0291658404522 SHA-256: 827554356a3ff6c435f09fa4670c5d6e0955a6cf5a30e5ca9a87460bb09d07ef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were extracted, the structure suggests the PDF is designed to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://ideylia.fr/uploads/file/57431333683.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609460bca38ee---nenetodi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/295214946bd436597e135ee4e611e03e/babewi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1bed72ec---96536534658.pdfIn PDF document text
    • http://atek-ent.com/upload/file/9149597415.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/zaraligaxerodadoberaladeg.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kmgbf442roc9bu9ao4q5eq1l90/zigumiwobabixeb.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/63957015498.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/wevunuvilarisinumemuz.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/deduramuzopudimozupufus.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/zasogoxademiseku.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/pagoferujafivajo.pdfIn PDF document text
    • https://t2sc.me/userfiles/32708678701.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/15b9e81c2acb54b53e6d13c616117ca5/23628648414.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/buvoxuvelipamawuwogerepog.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af90cf2bf6f---53781234665.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/bulezif.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/48108567381.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/fobosegojoxoduw.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/50365366114.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/185b659c2590b1609912659aaa90d679/rodejinuzoxajoxalana.pdfIn PDF document text
    • http://simoncaulkin.com/images/79519609061.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/46322953875.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vetuxadapuralidezoxenabut.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/39184550519.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/rataxusonometanezuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=isuzu+d%27max+2013+manualPDF 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_off0000d110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD110 10580 bytes
SHA-256: 17c6a77fcc5d193b8b16918a8ad1675790507c2ecdc80373b8f9d522a5badd54
font_01_sfnt_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 17404 bytes
SHA-256: 7abb80a7e3e7dc11670b0882bfb4f50d6a69d714288388b1e397f0db328f9991
font_02_sfnt_off00011697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1