Malicious PDF — malware analysis report

Static analysis result for SHA-256 c739d33a5d1f678f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 14:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b33e8b89f205f071d88929b3ad78a93e SHA-1: ce5e060b4b72f1cd59a33c72f0b9bfdb0016cc02 SHA-256: c739d33a5d1f678ff8bd49f4b0c0668262b704662e4dfdcbd9835593ebe6e9d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inprovitperu.com/ckfinder/userfiles/files/25303845613.pdf
    • https://livres-arts.com/ckfinder/userfiles/files/25569302920.pdf
    • https://girilawfirm.com/content_files/files/97206555600.pdf
    • http://russkiivopros.com/images/FCKeditor/file/42350088859.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/rawirofap.pdf
    • http://motoren-adachi.com/js/upload/files/68760989691.pdf
    • https://xehowo24h.com/images/ckeditor/files/51067471567.pdf
    • http://axiomestates.com/userfiles/file/70427893000.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161414dd1bef79---tegefojedojul.pdf
    • http://tantos.jp/js/upload/files/7566994067.pdf
    • https://dobre-akce.cz/media/files/file/61131064800.pdf
    • http://acutecardio.ru/sadm_files/lepigokulugoxibusaxobote.pdf
    • http://arci-mp.fr/admin/File/1075165549.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144944b064b3---botosinux.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/1716576644.pdf
    • https://harmony.im/userfiles/file/zagososigupipag.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/pivabalapig.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rvapl6rbmn8e85nh7tfcvpq8b5/zapogoredojoropid.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb7c274a9---62148987268.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+best+call+blocker+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_off0000b108.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 16792 bytes
font_01_sfnt_off0000c91f.bin
7eb927a10dec15ab0599ba5a770b55aa50788f97fda447aaabc501fedba068a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 10768 bytes
font_02_sfnt_off0000e1d6.bin
73f449cbbe159521b70b67b55945ca4fc570ec96db49fa73e8077f28e6672544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 19340 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.