Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc1f736a9f8403f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 10:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ba12eebf6742c1fe43ad921b62e202f SHA-1: 9c9276b810ccabafb89b5c3ef61f0a28cafa4249 SHA-256: 5bc1f736a9f8403ff76d8ddaaf918b4e36caa1a3787ac81f8a70e70158498509
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. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=filthy+frank+book+pdf', are key indicators of this malicious redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=filthy+frank+book+pdf PDF link annotation
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/aa3ae8202c4fc7a8d533ac59306bdc67/fitifoweta.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/27117306535.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/53725186848.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/6356877275.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6l9dt5s860esiiivted7q1u24k/11819120276.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc401c6c0---zabavirokamijezuxejetiwiv.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160821e3da81a0---ranafuxewudikajaket.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/edabe418e9a5db70654d9fd01a59e70d/38773487973.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/29606958019.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/29038343271.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad1ce7fd93ee34872bbe5283a047fbe9/56926796983.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vejomebutijirabozazexe.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kaxizidela.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-8/20210608224149888175.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/bexagepevedimaxobebofemur.pdfIn PDF document text
    • https://mahae.hu/files/files/92076031226.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/josofoxa.pdfIn PDF document text
    • http://woykoff.hu/upload/file/wazusilaxulogadugiju.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/26482209081.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/45368202930.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d3a242b41---paxopofupofeve.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/wujunapa.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_off0000b905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB905 18380 bytes
SHA-256: 0dc869d4dea5608fa0d3c2261eb2870403132fa125ffe8f2fe8c728ac9a0020d
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 10616 bytes
SHA-256: 678bcd93a54d6fae3434a9f07a3bf36ac901aa46403eb83968c993ff72683816
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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