Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bdefbd754242bd…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 07:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 087071185003cfd5700e9d618498d019 SHA-1: fa1ff79cf1b28191fa58569b678af6f2b86ca467 SHA-256: c3bdefbd754242bdbe4e4c54fd349d8df5433e911d171b198f428652295bbe41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=picsart+pro+free+apk
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c92fb331d9---97485497225.pdf
    • https://tonthephunglan.vn/upload/files/92010564330.pdf
    • http://pataibicaj.hu/userfiles/file/mewaregejopapulozevegeko.pdf
    • https://seedomoretravel.com/files/files/josotobup.pdf
    • https://condicionamentofisico.com/arquivos/file/vepak.pdf
    • http://studioguagnoni.it/userfiles/files/netipakiwizidukurapifaji.pdf
    • https://cauthinh.com/luutru/files/wosizikipunuj.pdf
    • http://chieucoingason.vn/files/fatenulatav.pdf
    • http://mstreatmentadvances.com/userfiles/files/fazakapevuxeworeva.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6ff8ebd252b2b54709071fc66afc796d/52937183685.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/30657571899.pdf
    • https://pierrelemagicien.com/userfiles/file/wuwevav.pdf
    • http://autoscuolemontagna.it/userfiles/files/vimeginolokusumomux.pdf
    • http://haliburtonhighlandsheritage.ca/userfiles/file/sikakipuka.pdf
    • http://egitara.com/upfiles/files/zowifata.pdf
    • http://hanasushimenifee.com/uploads/files/25065706729.pdf
    • http://nextgenship.net/upload/file/20210902163054726974.pdf
    • http://around-sicily.net/userfiles/file/wezameb.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bf4cc89491b1e108b16e0ab32596408e/34807227042.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/zupepisoselegowa.pdf
    • https://colakcivi.com/userfiles/file/40464301514.pdf
    • https://tsydesign.com/userfiles/jws/files/sujit.pdf
    • https://clubon.top/uploads/files/davapexemoxasuna.pdf
    • http://tauroconsulting.pl/userfiles/file/98932728134.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1f5.bin
d2ce2ade0a7023bf964c9665f70804d22e47d67b7982dcc96c61484a5e52a28a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F5 10416 bytes
font_01_sfnt_off0000d9be.bin
0d3aedb1d79988922d4e71a8411478c08a3137f175da8a985ce773adead2c7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 16084 bytes
font_02_sfnt_off000102de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 16792 bytes

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