Malicious PDF — malware analysis report

Static analysis result for SHA-256 913f5eeb2d9ac362…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 10:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf84f6e8bdc03d757b3d457f504739fc SHA-1: 48fe6b3aa77e5de0dc7f3b53d5a9a0e6b21c1825 SHA-256: 913f5eeb2d9ac362d8e351a509644fd50176bc43f6608c26380db93893fdf565
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fotografski-studio.kost.si/userfiles/file/13559446304.pdf
    • https://aquatrustfina.com/userfiles/file/52858110982.pdf
    • http://4reality.cz/userfiles/files/gosigamekaranu.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/86081588705.pdf
    • http://gdlejia.com/uploadfile/files/20210914_114617.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/74rk4sfdqtlltfpb9ln4cituj1/fogevetalimumev.pdf
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/89583461268.pdf
    • http://collectifff.be/imgdb/accueil/files/69429841853.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139696b9823c---tewoniwuzamobaxewumed.pdf
    • http://lindendirect.com/tempimg/file/38394368699.pdf
    • https://cuacuonbentre.com/upload/files/68271436231.pdf
    • https://mannoorpally.com/uploads/file/27797218248.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26deb8a79---zalepamilarupoliketogeg.pdf
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/gojomijemepaxa.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cdf9b9b40---42575538666.pdf
    • http://arci-mp.fr/admin/File/27563785529.pdf
    • http://congluc.com/upload/files/26688705608.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d83e05459796faa0f2bbc50eb0be010d/41469955678.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/96216256223.pdf
    • http://huefpdf.org/upload/file/23075577070.pdf
    • http://volvo-cars.jp/js/upload/files/vobonepulideseboduxorunu.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a63401bb9ff29697878a8e524a7bfd6c/mudekoxabosunivovufemimal.pdf
    • http://delfosventures.net/userfiles/files/xuluxuxik.pdf
    • http://juditphotography.com/picture/userfiles/file/nilevulegim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=football+prediction+apk
    • 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_off0000cce4.bin
8f657e59629ac7dd7ca0ce71c4493103c62215607edb42012d123ef81a0bd4d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 10548 bytes
font_01_sfnt_off0000e4cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 16792 bytes
font_02_sfnt_off0000fcdd.bin
403f19f829631619699f21b9c4452979bdaefe094ba4f65276181bd66b379aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 19836 bytes