Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a3557398504c36…

MALICIOUS

PDF

84.2 KB Created: 2021-07-13 20:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bba8cd9f11794e8ab805e57b4904772b SHA-1: 8a8e649ccb78a5261e273dfa06efadb9deac0bc4 SHA-256: 82a3557398504c36c0642faf3d6babd9505e358e5bb453c16439382c1585b5e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links form a link farm, likely intended to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=procrastinating+from+studying
    • http://alnadaoil.com/userfiles/file/zozimuwato.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f8gfl8ntgehc7o74vuej5bpf0/gulalipunan.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/c5ac1fe789177dd2b6ebb3b3c3310eb8/90603255656.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/7e9vhin4hstr2etjkt5pt6j054/78492674212.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1e7f2ba303a93bb1f742bd561bcf6c32/95411142120.pdf
    • http://bobas24.pl/Upload/file/kokikukituro.pdf
    • http://beastyenergy.com/userfiles/file/87849916304.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6fcfc7819acfe0172d0b01f7b6990ebf/virak.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/l6q4p6jecnijnhfo4jktind6ja/72607537772.pdf
    • https://liniagdanskzydowo.pl/files/saketujudenimirur.pdf
    • https://torgradio.ru/new/files/file/kisoxujewewaratetud.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d305fd78436---vuvex.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a72671a3---81059229240.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/wowurimeg.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0e0e76b17f0d43016ffcfe18e85eed94/37219644411.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823ea00e18a---25145685511.pdf
    • http://blackhorsesc.pl/userfiles/file/lepogasupe.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160909d3367c78---xafomikaru.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a108c5904fb---46492087664.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1efe36b18---6853602385.pdf
    • https://kurishupally.org/userfiles/file/33208806235.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/123febdb192f6020cd469cc0697b3068/68765293514.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_off0000e7c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 16792 bytes
font_01_sfnt_off0000ffde.bin
432c549ebce6ca70eeb659ce7e8ddc998c1c56e1e131c8344b04c6593649c3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 10856 bytes
font_02_sfnt_off000118bf.bin
51b9a02cc3eb77fcb28d1a7131dd99fabde29bab0fde7071a0842be7956c58e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BF 16548 bytes