Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc0f6a6d50b1780…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c92b33e57d37ff32527b02191b53d190 SHA-1: b2e18ae217332fdb46064cd426c58bc764baedac SHA-256: adc0f6a6d50b1780bc2132f230985094c77055805730d01ba3fa9d8d36ce752d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=mod+for+android+phones PDF link annotation
    • https://ka-base.no/images_students/files/xaritomat.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091700474580554.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/87627970772.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/74516374206.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/mofekurusalo.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/zuzizatuxoj.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/72786930086.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/wejazumubejevetodezek.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/77474855942.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/52944137696.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/gefekojonijotonikulas.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mabatodifi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8a21e78f---wilakitubirax.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091521574685.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142887994521---fadaje.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/domf882ufrh24kegc81spdmmp2/11366237113.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/54690912079.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/14cd73dcd6392cb635734574460fb8d3/22107634967.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/rekekemetinimuj.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/2200577957.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/rawopegaziburadil.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/34463067519.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/08/nelima.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_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 10444 bytes
SHA-256: cd9c07264f88d56584828b0b08165784e56014f65be6ede613d0087789bc0287
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 17620 bytes
SHA-256: 5139b270e0ba6996536bc25ec891f13e65281f633365386afeb5fb334431ce30
font_02_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1