Malicious PDF — malware analysis report

Static analysis result for SHA-256 662dd522d9bad801…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 02:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21e19994c0da2917386f6fd86f60e21d SHA-1: 71b65c1b9e2f6f7bc711313eef5774c8da21c730 SHA-256: 662dd522d9bad80182bb0135fbcba28fa16784105df82d53483e24b3048ce77f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a phishing detection by ClamAV and an ML classifier. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=how+to+make+background+black+and+white+in+android PDF link annotation
    • http://geredekombiservisi.com/userfiles/file/tomakovetime.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/dipapirobavifurok.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed628c246---64458605759.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/fekefopobifadomivokoxali.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/31813063329.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/pijitibilidipuf.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1118a8578---xopeduzi.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/12063819214.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/41577525182.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/wuvebow.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/japesasogujok.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/44837190914.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/62940278514.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/66094303431.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/34521659066.pdfIn PDF document text
    • http://pasted-radio.de/web/files/40628932620.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146d84e792b7---xetofi.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/73079220275.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikagowuledibaperetam.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/vodisifaranoronekada.pdfIn PDF document text
    • http://dd-eng.com/files/files/51161732489.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133678d7b423---40651105484.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/jopivurofuzagona.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/xakelefusazegagu.pdfIn PDF document text
    • https://afayl.com/userfiles/file/42472663390.pdfIn PDF document text
    • 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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 11060 bytes
SHA-256: b5ec2d344e0d9fd7da94b741773e1e4b97dc0a3b1e8a6dcee6c3855cec37e79a
font_02_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 17432 bytes
SHA-256: 74d0f5627fa6357d2f92440cef9864790bfc85ffbd60a38dc163044262446181

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