Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6386ee15adf211…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 09:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 697807875ee092ea22ba26ac2cc51191 SHA-1: 2f2db763e72f39c38cdae9ff859cc6317b9a5d67 SHA-256: 0c6386ee15adf2119c24fbf421023ddc578aecb378992c95c370bef74eec5808
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • 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 http://fsoa.cn/userfiles/file/17122506947.pdf In PDF document text
    • http://floralojistik.com/userfiles/file/temimasakan.pdfIn PDF document text
    • https://promise-land.com/upload/file/82077129745.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/mazar.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/90719046942.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de465e6d90---90259046146.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/89973400329.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cca65cfa0---fanikinebukutarosajiwir.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/vonag.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161318d6d24d78---97414097399.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/fq9tse7ti1hlh2k666tj4m0ovm/jifajijawagigoja.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/85199974978.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/30810055404.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d0065acef071d78299e197a8e1e892fd/57952558938.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff748162ac---xirirevemenubiz.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/9171897891.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/n2hrbrtele2rt6pc3c3pcv3a2q/jidalixasesigepi.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/1281000911.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/15213960681.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/77705497874.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/37312769793.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/givoniwogit.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6119feefedb395d6d733c420fb1d843c/6270657430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=must+have+apps+for+android+car+stereoPDF link annotation
    • 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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 17360 bytes
SHA-256: 5ed30e46f1314e49c6aa2d5929f36c9719daf172685b44d9c374de863fcfc6f0
font_02_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 10832 bytes
SHA-256: 599ec7e1b0ac9dfcf652b44ec5ca6aa3513e6cb75074e726f4e6ac8edaf87e5e