Malicious PDF — malware analysis report

Static analysis result for SHA-256 9772a5a9d4cfb64c…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 06:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ea8e2bee4bc1836eb88bc5ea5278f0d6 SHA-1: 9f9b1c2e86f4294606df66d87a6485f26752ebe1 SHA-256: 9772a5a9d4cfb64ca1a6d7b0f50289588a59c3f4b1324e94856630c925ee5c2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs likely lead to further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=features+of+mac+operating+system+pdf PDF link annotation
    • https://cahayaapi1.com/contents//files/25258011481.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6d189afe---vidaxi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kavexuwekilunimafagoreb.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/20ub2jarobdmm5pvf5vsg9gb3n/3406560868.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/zabadadumivitijad.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/f3462e52dcd1d771ba02120b7ad30cb5/loratirakopafuvix.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac9a7d4e9e16166abbfaae40e3bdd4d2/68455687313.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/jorubejoninabakonori.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3fad5482f3c4dd48c6a8b257982c2019/73120317561.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/41753172573.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/gotonazeregubuful.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/98842212538.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2926608ceac7edc0d7318b5d07a7d621/zitujofirofisorakil.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c464bc43c---71501446881.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/47234423836.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/sezozulogusu.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/42808209373.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8bb158d7---gelumefobudimezev.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/upk5gogc939e9hrk9jpl017tge/63277619812.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/tlvjdp3uephgruvitfc4sd5uv7/gawowabatamupufus.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/godurisevalimotapa.pdfIn PDF document text
    • http://www.toptehnik.si/images/xusejuvu.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/61dbd1bde87ae92f09c93422400cfe3d/13785051303.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/mewezudirejoxijet.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69d42f4be---fijogoloti.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_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 11108 bytes
SHA-256: 7953a1206a564f17f5b4334b1242f509b8e6324506da24023e2a03a4c028d665
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 16820 bytes
SHA-256: 01060285d4ec02a98ab3cb92519ea97e1a122c4c03ef399ea48b50d0435306da
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1