Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6df1f755b7b91c…

MALICIOUS

PDF

105.9 KB Created: 2021-08-21 04:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77e1f38c00669bcdf614e969357dac34 SHA-1: 3868fc73149c3030743dc678d9efcf402874d284 SHA-256: ea6df1f755b7b91cdbaccd2134661eb7395818ef265f91e5eb69ec9772cd6959
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to domains flagged as compromised or disposable. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users. The primary purpose appears to be to lure users to external sites, potentially for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://daoltrading.com/userData/board/file/didukesiwupezisavabixawi.pdf In PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b9809baa---kobipoxusesekugorajuviz.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/nipozofudanegegevone.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/tipisitemeworezineb.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2geg44jpudodd195mj4c6c4rh7/dabulukinus.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/87709591022.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/lefimozisiwobus.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/torubikekikufato.pdfIn PDF document text
    • https://ultralloy.net/upload/files/jedidulawe.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/4ot5v1fljns3ifqava2fria132/dutelit.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2f4b1c023c1ff719d4d89a1bf4339007/66327053108.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/40820419717.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6bd18152189338837e319de21c058ac8/vereluranorifuvalajijewoj.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ad49fda90c2d0cfc95d13c1b1253f9a9/vilegaxiduliberaxuvilapa.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/de3772896282a88f6775ed00d96cfb7e/44916455869.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/xibarez.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/20437799527.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817266a5b49---lenamojilul.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/12du7o8u4hu9naa2u55u1kdrbf/luwaz.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/sixifamiwipenukizoza.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf6b2fefc---71624809824.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795371289c8---68469881477.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65907453b0---68102326204.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/8qdg3qob51i5rjr958hs16ad5r/zobikaladijiwipi.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/giduxufirelodadawot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=el+mejor+libro+de+cabala+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 19036 bytes
SHA-256: c51e4b78dd3929a127cfeb586fbc785813b2d11d9a8fb26c221ba630815002dd
font_01_sfnt_off00013746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5D 10664 bytes
SHA-256: a1a3d5af221f331f6835a1e7018fa8ef25583accf234bb524bff288a7bec4d4f
font_03_sfnt_off0001676a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676A 18744 bytes
SHA-256: 2051c0141a02ebf61270beb74f1c0a93a757e8471d58168981fba2511e07f5e8

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