Malicious PDF — malware analysis report

Static analysis result for SHA-256 857071728cf54ccd…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 15:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9ff15b5d06b262f07b645ef1bf96b8ae SHA-1: 937718f872824d640f5071e022456d20ac2a6a6e SHA-256: 857071728cf54ccd5d384403239c33c3046140754b20740f442d48abe35bddba
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristics indicate that the document is part of a link farm hosted on compromised websites, attempting to lure users with a fake download for a game update. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://ketchas.ru/uplcv?utm_term=minecraft+nether+update+free+apk PDF link annotation
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/voloremozomun.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/gesukizono.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/45174583857.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/sakilojejugetitepit.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/95538606018.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/80aec904a704cf9ef9c6486b8bf13393/44969349279.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f9408060c7407daebd6c6c858e95c063/xasuputobopanipaxosufo.pdfIn PDF document text
    • https://preciseenergygroup.com/media/fofege.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/xesinimekofedosoreve.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/60033657051.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/2011732162.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/10495524813.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/59004778372.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/vowuzezita.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/7680389408.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e7c57a6ed2ab97d1db3f5bb7f427049a/ratigorixikogo.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/42361923030.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/sajogodalufewibutuf.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/zoxeb.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/39873400576.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d5d42abf0c28eabaa03dc730f9ab716f/16014199264.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/watefoxudef.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/loxudunufisepezemi.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/43966364637.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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 15824 bytes
SHA-256: b8d487505c671d4084239f73d331f9cf2c6138c0c6963fada25c1b1d8c70007e
font_01_sfnt_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10568 bytes
SHA-256: 8b192c717d796da91f620fff9bfee2c5644644cdde61ba8ab4064cfc6fb05f41

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