Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e56a1d647b5b34…

MALICIOUS

PDF

81.9 KB Created: 2021-08-22 05:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f36e2280d6ec7fd309860d676257a399 SHA-1: 95b2d00dfc1b5ae06041b836bd39aa0dfaf114a8 SHA-256: c5e56a1d647b5b34cccdbfc6d1bcbc53bcb2eafdbd0049b1e453bdab1954a00e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of further malicious payloads. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://aimecostruzioni.it/userfiles/files/wifumizifa.pdf
    • https://underworldgear.com/upload/users/files/jeruparivivekamevaso.pdf
    • http://hongdanhaudio.com/luutru/files/voxefufazofewalejexina.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/10135854200.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/68471404935.pdf
    • http://hanabi-la.com/uploads/files/fubefarepomapima.pdf
    • https://parc-hotel.info/file/55969404212.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d7953ec58294980f25de4f6255594b4c/60930069402.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4c028b27b---96100994960.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8a21e7cd---bijuzuvepenujupesiluxufax.pdf
    • https://stijsr.com/userfiles/file/44742481490.pdf
    • http://elijasprojekts.lv/files/file/7313260627.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m76p01gbc9s0uifvg3qeo1rsj9/47852422441.pdf
    • http://aliceinformaticasrl.com/user/pages/40277546618.pdf
    • http://worldplastsolution.com/ckfinder/userfiles/files/kabijesixusenu.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5d0b729b---wufimoner.pdf
    • http://szilasfood.hu/pic_upload/files/50997191784.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce2a661fde---xiwepepinoj.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7946b37b8---resof.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97a4ac7887---72230831981.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-7-4/20210704162224201208.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb9b20f47f---ruworudutukudufiposudit.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcbd3445e---71546295810.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+mp3+cutter+apk+for+android
    • 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_off0000da7a.bin
4cc79881e4b3e0389f5bbf493b3830db9e38954b8ada5ae4d759208f3d350f46
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 17204 bytes
font_01_sfnt_off00010758.bin
5a239aa16ff40d415a81c8c708d4ddfd97f17b87dd66561cd7d7207614aa4417
pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 11064 bytes
font_02_sfnt_off00012127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 16792 bytes