Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1a3193a2955882…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 09:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06e3943af6c0ae592dd8916449c76a56 SHA-1: 49f046e9f04413388f89ef75d6025cd9fee29bcb SHA-256: fb1a3193a295588245bdfc85c4705f09e34adb6a8e5023d89b0b706b75c4a85e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://synerhu.ru/uplcv?utm_term=rule+out+phrasal+verb PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ccd347673709550e2857fc093cad6e73/56810021774.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43859aafbe---jetidenedobexuna.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/df27487162adebca944634d151a51ef9/75674976794.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4c254950---miribozedipexepejiwig.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/91533401875.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/25879013732.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/m10b3gkee6l5uila4dopdul8ps/lojadepegidoxod.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/2dd54c27b63629ce9eecc0cb4d1e2491/dagegiwidapewixamev.pdfIn PDF document text
    • https://hsse.cl/files/wixaperefowoxal.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aba4f0b8ec---38855991447.pdfIn PDF document text
    • http://sun-eko.eu/files/file/nipupirorijufivatilagu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1cb49a2043173dd74d94e3b4c608bd09/15434777837.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/9311381902.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d71716bb---98800107562.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a454dc09e2d---7157725590.pdfIn PDF document text
    • http://apcmagon.com/userfiles/ritedakope.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3umct7d0mctmdghfdrh0kdtvb1/jaratog.pdfIn PDF document text
    • http://beiks.info/public/file/nejijesabazumon.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/moikdb7anu7o7gc8e24j8ogqs8/47705379795.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8rmpihqeghd61g49ptbj43hjm1/xikotatizukegovebozexozel.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/sonakipozedofakoravodofun.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vv7mr3gqha2bicoo5ihph9r8db/79792282948.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c389c1c6796---90395993152.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD010 10504 bytes
SHA-256: 36f3b738647f6e3a89404be3e236f28b6a62a0e42f5d4aa9e31f70e401498f57
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 16120 bytes
SHA-256: fc96bb51e68212267b34b5acefce01e3ce1e469c7be8c0a453211fcdfa4f682a
font_02_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 17388 bytes
SHA-256: 613e6fafed36b19ac608dea432cea534f869a5ffaca3b3c954a69937ca055332

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