Malicious PDF — malware analysis report

Static analysis result for SHA-256 937e1748d06561fc…

MALICIOUS

PDF

76.0 KB Created: 2021-10-01 05:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64b9876e591af2853bc5c4e929bc8c69 SHA-1: 73254b15e747c360837b3fde2597c202be3bd2c9 SHA-256: 937e1748d06561fc29c39322237467fd130657ede303efc92cebf3c01cc9e64b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be distributing malicious content or manipulating search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=one+night+at+the+call+centre+book+pdf+free+download PDF link annotation
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/lefitelikezewaxuxitufe.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/bojarosegam.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a85cb199---48489708736.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/litesabux.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/lizisemesozufad.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/valuxebami.pdfIn PDF document text
    • http://forestheightsgarden.com/ckupload/files/nowadopudunuzijo.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/61683793914.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/2881867872.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/75312291970.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/99848899868.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/78126936577.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/60904078313.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gigejogezidobadapemuwej.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/98663430139.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/68622189135.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/gudananagudapu.pdfIn PDF document text
    • http://kezmosas.hu/files/file/30946524784.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/64219932477.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c28890363c---ruxojavirinujirovaxejodo.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/sigoxun.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/14398402839.pdfIn PDF document text
    • http://bamor.org/userfiles/file/35559287970.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/64e982ca2fc56ea541108d9f86b7aa99/jagorokuxufavadaj.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/86e612918831971540138f5fec4c7274/befudimikotanatokodu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/53986623075.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/sewififoz.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_off0000c040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 18648 bytes
SHA-256: dae491fedf9f52aa1114433087807d4996bea11c28fbc2547b72364fb440c9b0
font_02_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 11076 bytes
SHA-256: b12da05edbcd4108e92d1a80760b6dd4be8c40d8b6b990878091415c6e6b1214

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