Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d4fc9ba9e0ae5b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-30 14:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11dde30b5df317ff5009597e35a26570 SHA-1: ecb56c9f8c7dd1264ec6de1b320448d0d7f7c302 SHA-256: 05d4fc9ba9e0ae5bf32f927b642c672951af74d875c6758d107c12306a7cee1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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://faizleathergloves.com/userfiles/files/rezavaboxinodov.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161507047df40b---70294507003.pdf
    • https://thietbivesinhsonhoa.com/webroot/img/files/81876145856.pdf
    • https://defi128.phpascal.com/userfiles/files/58543222000.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u7sho62b356bpduc5dv5ctip6a/48634674747.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8uqsigadgqlqihsqgl8qd18a11/kenofomeruzizinidubak.pdf
    • https://deltarealestate-eg.com/userfiles/file/tinis.pdf
    • http://horizonpestservices.com/userfile/28787217339.pdf
    • http://abwingsbuffalo.com/uploads/files/4709801803.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/60033310188.pdf
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/61357430087.pdf
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/tepebe.pdf
    • http://fasson.vip/images/editor/files/81506839298.pdf
    • http://purel-biopharm.com/upload/files/652073087.pdf
    • https://kompaspt1.com/contents/files/80008690791.pdf
    • https://riolisboa.com/images/ul_files/file/gfoVRHcFsB10.pdf
    • http://elfuklid.cz/foto/Image/file/1762112380.pdf
    • https://baglab.pl/galeria/file/589621743.pdf
    • https://internationalmedia.com/userfiles/file/sidevivun.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/66436604711.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7fa5c3485a426d25de6b45a84b0c8d6f/59714761511.pdf
    • http://www.armstrongre.com/files/files/87449180172.pdf
    • http://kompassztuki.pl/Image/files/ramexejojegede.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=buy+cheap+primogems
    • 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_off0000b58b.bin
476d0371f032301d7b858f305d63654f50a8b782d50b4fd985d7bdda3e1fdce7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB58B 16916 bytes
font_01_sfnt_off0000e0ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
font_02_sfnt_off0000f905.bin
c8fed7e3204931b3c4517f77c27a73544150939afa9c4ca7a011fc8d180671c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 10840 bytes