Malicious PDF — malware analysis report

Static analysis result for SHA-256 80db99f975832edd…

MALICIOUS

PDF

89.3 KB Created: 2021-09-20 19:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6c1581068bb0e164bdd89dc5788b78a SHA-1: 8cfe34b1c7d3bfb1dc32d028785b04b9aefa2b65 SHA-256: 80db99f975832edd66c86cb01f8b973f3d261099b090f5cf79c1ea3346f64f05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. These elements suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f3784010---78857758849.pdf In PDF document text
    • https://incense888.com/uploads/files/202109200351492535.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/66598572355.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/foxobilifozezotog.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6aaa3e9b7---femupefinemewot.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/bevopazuwiripatakesesaga.pdfIn PDF document text
    • https://italvaping.com/file/79009781564.pdfIn PDF document text
    • http://wenxuezj.com/images/File/65152542147.pdfIn PDF document text
    • http://debten.net/UserFiles/File/86741316522.pdfIn PDF document text
    • http://henca.com/files/details/file/nonenogapafoxawag.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/33387378607.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/ledifefijakevuzeroxi.pdfIn PDF document text
    • http://zenkatsu.dk/files/30549314275.pdfIn PDF document text
    • http://forti.in/userfiles/file/16693426181.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ecf2a2af---3812964030.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/tosarowukoramobesi.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/jubijufamebobozokonas.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/83d008b6163240a9dd04e2880c133a84/25901968870.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/66623835337.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/69127379543.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/lowatesadetanewiwutonidol.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109090305004581.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/zegotuzipolajaro.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22084055294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=babumoshai+bandookbaaz+full+movie+online+watch+freePDF 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_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 17596 bytes
SHA-256: b312fa888ff005bf78316a04d9266aee385a8ceb67abdc5b1ae07fe804179db8
font_01_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEA 11336 bytes
SHA-256: 1bcaa903a28616393c368121a72dfb9ba20638187e23c7456829b37b69039931

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