Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b5181688253259…

MALICIOUS

PDF

105.8 KB Created: 2021-08-09 09:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca55be4c3a90c97c5563f0ae30ba55b2 SHA-1: 9f06d4c64cbd69b4a620ad3b0de8b74ec215e395 SHA-256: 56b5181688253259d54661b0a4f6a1c5fceb198fce4f5c9c9b5831f49a3c0e8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce79339de---jefofajewuridukeredima.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ffa4eeaaf---76728967651.pdfIn PDF document text
    • http://zaiger.ru/img/file/60982524036.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/uokn1cbe0sdd9g91f59jph2au2/xuduv.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2a2bdd82---filovivonaposalelogafuge.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/gekenopumalosogisasi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160705a7b2005f---rofulanatofuguno.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/11484932581.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/paveniz.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/fe08ea257d2ba26fc23c232f295280ca/88679308652.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/dazes.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/losozadod.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/robaduku.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/radevavoxafalegu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08a89407a4---papizorudivinabakukigone.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4j2hqrpe78bn95b7v2ellv1s3d/menusanovused.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/812169e92f0b8c7631f0c26a1bfdb426/jedafatilenizosenixozapi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/77e4df05343a8a031d272b1e4a539b4d/tadidaburowekekubevej.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/dosof.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/42308748943.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/78141759057.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1453378d65272a2fb35914bb98a0d04/sipolaxasuvuwaxemofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=joe+and+charlie+step+10+worksheetPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF5 10956 bytes
SHA-256: 37c8b129857fad19e5f49c3956617092b0dbaf637f40dea024c3bdfe9c20fec8
font_02_sfnt_off00016859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16859 17872 bytes
SHA-256: fc8fb41332dcccfdd8e66d09cab1d385fcb56b8bf91ab3672dfb5cdb4a4df2e0

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