Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c6215d0fdbea94…

MALICIOUS

PDF

69.8 KB Created: 2021-09-17 07:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef47b6b1714616edc8b19cb147d03435 SHA-1: 543baa530f4a01de6efaf98d56fe00f2f480bd0e SHA-256: 56c6215d0fdbea947f4a0356989ff7fa495cdb15168e1a689b7a28bc65842b92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of ML and ClamAV detections, along with heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggests malicious intent. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=wifi+hack+apk+no+root PDF link annotation
    • http://afghansolar.com/userfiles/file/67678551673.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zedubimotubimubijofig.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/3699966526.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/nixafujuluxuvoz.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/logiropa.pdfIn PDF document text
    • http://nova-auto.com/upload/27384433427.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/lelisibifunudiravedas.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/pefaxadi.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/gosido.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/57549495955.pdfIn PDF document text
    • http://boldogelet.hu/media/91760328819.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/gesatavikezebavativinugog.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3961b548c1d387dbef0b2a2c45964bee/rokolerudolumeruwari.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/64456519056.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/67348226665.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/dutozeneb.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d605d32b1---58984659966.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jesokoxexakopafurevogu.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/jakelomuvakesokaguno.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/vivoxuvosivosala.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/wusiwuwul.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d046069328b8ce968bc190fa414f760a/mezokivakuwegevilefugedal.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/darovunoponez.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_off0000b479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC90 10316 bytes
SHA-256: 6fcf2c9239811eb6d83099e97c6be716961113ddd7cdb76106e727b5ab2293fe
font_02_sfnt_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 15004 bytes
SHA-256: c586e3361b63a1cfead498a220f6b0037a466a95664a698ba63f454d07137698

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