Malicious PDF — malware analysis report

Static analysis result for SHA-256 d805a48c50d1d21c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 11:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 664989d3c22e05e4aaa190dd92157eb1 SHA-1: 2bc396318f7ad091d7ddb0e42aec5c130c89f577 SHA-256: d805a48c50d1d21c84785e0a58bd86ae66b8fbabb7c02181e348cc498642feb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users through embedded links to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=1994+toyota+supra+workshop+manual PDF link annotation
    • https://majubesar.com/contents//files/66312021626.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077db1a0443c---vubeka.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d570ce95542---saninowevusos.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/53950717957.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/faduropoz.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a592ad9c83---birafowurures.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/5724307637.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/70565991781.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160925704cda0c---sasadifaburarim.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/dipiterusever.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/l5q3nef2rlgd8ioc4i8bqdvhel/89511489243.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160801ad4398c2---31951352238.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zusonefosajadiwesunomoxut.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092b106f0080---50885125463.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/jiwalulapiritepitasibore.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/loruferin.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/56559295675.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210627024840.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4d22e268a191a1d8e2206946e049640c/69981773988.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/dijisubamijirulone.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/50193c6bbf21e125611f8aec3bc215c8/80057313263.pdfIn PDF document text
    • http://orderkai.com/uploads/files/dasovatedisokovo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc5c549944---larifapoxobaxipusotep.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d29836435763cef213011d7ab04ae2fe/61288706616.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/sajagodiwivofiko.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_off0000c1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 16612 bytes
SHA-256: 76e5dfef34e139d6542d3d4c68f94a3ceb0fc73b5d51f0299a86df5ec2fc3c2f
font_02_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 10884 bytes
SHA-256: cbbebc4e869433df9566e5e5deb656a7e644e30e4f4578839c518f4addc2abe8