Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1264ed427da68f…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 18:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bb4bd80413047eaf63b0b933c89a7de SHA-1: ce92b518f74e0308855b1fe5e14bb3365bba0332 SHA-256: 0a1264ed427da68f3a20793e7ef9c924bbae4dab15c5153026626a6d1f94d4f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised CMS upload directories, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aashianarealty.com/file/98044846346.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16079495b46b2a---80291789611.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0c91d3d2e4c4290e27ed6abdd5a9e534/vatidivefexonugujo.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094981603be1---19163116168.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/eeb5cf08b6eeef2e1a2f2a914679fada/87852197777.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad380e734a4---66742170697.pdf
    • http://casaatlantida.com/userfiles/file///sifizidu.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4bvkhvk5vfb2ok18d3g5ind7ve/4095768025.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990f40b61d0---58271504963.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87282dc8d---bubelefo.pdf
    • https://medtek.vn/storage/file/xezar.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b3bc49a79cdf36961103e85a092b5b33/wimilazixesunomanulijo.pdf
    • https://pasarantogel2.com/contents//files/boripul.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a533704e6ef---mopujodubuwepenenalalaz.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b28119fb51a6eb78bb826a2187a506f6/kolewuluzoxowovubone.pdf
    • http://zdrowejaja.com/Upload/file/80711208515.pdf
    • http://abacusnancy.com/userfiles/file/majuwubomejiz.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/1789dfaef71ad3a624d39911c3512498/85317662073.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802006cd02e---33963467890.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kvl8pss60gi685fisdni370rja/junibulapilisuwi.pdf
    • http://ajtoablakcentrum.com/_user/file/86736634586.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e08e154630---44692176227.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c1fac8e91d9d6e28579b2376417526d1/33146575701.pdf
    • http://files.ibiza-ferien.de/file/punenidimu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=8+letter+word+starting+with+ce
    • http://s292376414.onlinehome.fr/datas/imgmail/file/57451013576.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_off0000f0ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16792 bytes
font_01_sfnt_off000108bf.bin
815e6243ca3f49723e7e3db739c84f26ef22bc411273388dc9b551547bf61388
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 17856 bytes
font_02_sfnt_off000137a2.bin
2ca27f5f94247ec1837eeeddfcf9eef5ad93d8ba2bbb101120694ffcd618ecf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 10844 bytes