Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb39202505c99aef…

MALICIOUS

PDF

90.0 KB Created: 2021-08-23 16:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e30bb539518fcc2cd859df4213b4981 SHA-1: 33359c13f3d8050d2d4d2ba3dbfe025bc92ca5e1 SHA-256: bb39202505c99aeff29a42c5656c58b38174aa4c8a001f2e6b01aea5a96c2241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest this document is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=type+a+dissection+repair PDF link annotation
    • http://dianacb.cz/userfiles/file/87109282411.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46150b2554---furutitikojozuladodaxe.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/fubarusabilitukod.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3020c28a---74544508603.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/diwefidazerugafozanuta.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/vc1cqg661ct17ht4qab5r94ec6/mipivosifejalirutorij.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/nuzeridev.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/tamakuduramorun.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/r5tld32ovql77ee5mmjifrsbq5/84805027071.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/37202096280.pdfIn PDF document text
    • https://airbays.com/userfiles/file/70083768187.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/56d5caa0d0d0d2cc931d17aef3bc9e09/doxiruter.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/4953586758.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/28309400660.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/sufuwakedogetijazilofewor.pdfIn PDF document text
    • http://belovosushi.ru/files/64063219875.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/rotame.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087107468988---44261179786.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/jq2japshqr68oagvjpn1935dvl/kafunumibavibinamazirit.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/22038405910.pdfIn PDF document text
    • http://cochu.net/resimler/files/jukekujopinu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92a97d5e9---taruw.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_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 16792 bytes
SHA-256: ae722edda4135f76cca946e2d2d1f78eb1ea4744d12dbf78f217272ce35bb8d2
font_02_sfnt_off000141a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A0 10536 bytes
SHA-256: d460a0ace35e2f208eec08cec242f67044782828d002030b5940562f7790b748

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