Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b1a972fabf4daa…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 23:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f98396e009cf12c7511006a21614df9 SHA-1: 6fc4f09e4c84f8e1f0b9595ec3c83066d312c531 SHA-256: d0b1a972fabf4daa7ecf888ea4abc32592b324eed8b04395586d9887a0ce00c0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=identification+parade+pdf
    • http://alexdisinfestazioni.com/userfiles/files/liduwaduxedexuwu.pdf
    • https://www.disbel.es//ckfinder/userfiles/files/88607689209.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/lomiwa.pdf
    • http://radis-rrl.ru/userfiles/image/xomufumematariguk.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d287dcc1e8d---34574435720.pdf
    • http://navigator-nsk.ru/userfiles/file/jiriladezefagoserolapep.pdf
    • https://texigo.tw/upfile/files/2021/07/27/41658322589.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h76o4d7302j6hnso28fv2ltt04/nuwojapufajelikonotamin.pdf
    • https://stancijanegrin.com/UserFiles/files/68026936425.pdf
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/96670151304.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7b09312073829e8598b16149ff143f9b/2844738973.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05b8689aa---vinakekelakojogofuxoto.pdf
    • http://mobiliteit.nu/files/parimewewewevenal.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/19184359061.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc72853502---26413298903.pdf
    • https://callmarkinvestments.com/callmark/files/83133627640.pdf
    • http://bbmpva.nl/fckassets/file/mijewo.pdf
    • http://sns.hu/_user/file/22676367016.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b021d3a3---18567569445.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/16721477030.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/voxeguzewojakizisijuliwis.pdf
    • http://riccaassociati.eu/userfiles/files/betesa.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd7254196---88629794591.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4fac378913ca7e499537c3edd05f72df/56522666914.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607654f7ec417---saviselatomobeninojegukum.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 16792 bytes
font_01_sfnt_off0000fa3c.bin
8ee7337e1d690c80a98294a5fb883fafdd8195df66b0e198b10fc2273434c9f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 17576 bytes
font_02_sfnt_off000127fa.bin
6e2376cecf2b759466f4d60e9536c20654db813fec19059197c273ce4d3fb59d
pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 10352 bytes