Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf4b7f5823ac2a4…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 20:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 216dea4465c66e2040987d8873e7c446 SHA-1: 5b20826895427124e7e12d2b4eba90c2ab2c5d6f SHA-256: bcf4b7f5823ac2a4d12a1451d42db8da54a95dedf80f1b47669907ff4635e64d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=android+app+icon+size+generator PDF link annotation
    • https://fallahi-sch.com/userfiles/file/figopasolitibamevusa.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/93239488561.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/rotexadesajewavu.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/gelemirugegidosasurire.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/28255610102.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/tewezotadeb.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/tebidizofudejigitadufob.pdfIn PDF document text
    • https://csn-alliance.com/data/files/mavomulepikavasapo.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/70931369478.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa85d4ef58---benunagewebonixox.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/sufakakafulidiwijov.pdfIn PDF document text
    • http://promenade-perpignan.com/userfiles/file/18850386231.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/wirilekuxuxiz.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/32273391156.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/lakuvemuvemabowifud.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be81d19de---52525663159.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/lenagekixi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161365c071ed96---rebovixojigadifa.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/33876107127.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210911_E51771E7F1F7C649.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/56728459908.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/nofemevolutunaxi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c82db0ad4---venetezi.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/pijarevujimotebuzuditobu.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_off0000bb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 17492 bytes
SHA-256: 83cad839d6a9465e530e2f0ec0c2bf5e9cfafae7ea3078e267bebaf8e07b2bd6
font_02_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 10684 bytes
SHA-256: 6f82088db81dca9bdab06b5d0d22a364111d89b3458c502ee30a03f5747186ac

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