Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92f3e9b7bfeca2f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 09:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 935b22abb3e9f2aac0dfd7724e894052 SHA-1: c34a59fa02c137eabf6d50767dc94fb696ed2977 SHA-256: d92f3e9b7bfeca2fe5660c07da93ed3ac4f8d7a890341f06fc5697ec0b957bc4
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=gdmss+plus+apk+for+android+tv PDF link annotation
    • http://righetti-ticozzi.it/userfiles/files/varipavagagamu.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/56134620329.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/94032346672.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/46272724122.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/jitoxo.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/fizaz.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/tetajamiwonaduxilowifape.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/tepuvituvivuxejubogawulav.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/dekezevitibozoze.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/97932436671.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210901171801.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/6268480396.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/72968745420.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/vetuvojiti.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/16447219957.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7bfe53b64e87fcb6c304f125c1123bc9/74425589851.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/ruwotavinazobizopuganudo.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/fofovowanuxigenis.pdfIn PDF document text
    • https://diphong.com/uploads/dugapa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614106d38be05---jokivowokuxaxiberi.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/60084798099.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470d0b63138---1699611559.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/8644841507.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/gumenif.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_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 18244 bytes
SHA-256: 3f33fb47dac13262c2900d41ba6561ee2b8af43e08e173e9f5217ccef72ba968
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 10824 bytes
SHA-256: e971d01a625ed8521ec497766fe3f0fa6b1bb37e5ebccabd10a037d2a0ffeb34