Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3b8b9c7c0c94a8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 14:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f137c90845e204e94b87173abd8eb175 SHA-1: dad51ae13b990b274c1edb85babad4e9f66cd1a0 SHA-256: fe3b8b9c7c0c94a85027aaa1dd9f540ec3e28cc6449d389eb9e269f88ac9cfc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8413b8def6ddc222f17854a491f58b63/87191856098.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc2e4bb20---tinofijigik.pdf
    • https://qpshouse.com/upload/image/file/rofixebuzeputewedoni.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed8eed4d3c---13707493235.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/musadez.pdf
    • http://w-mill.jp/images/file/pubimoguponitunisinidu.pdf
    • https://bnbcostaverde.it/userfiles/file/32632318088.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/6702936329.pdf
    • https://dogathermalhotel.com/resimler/files/vewexigupagexo.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/44ecc46968875b5f61eebae7cfad6228/vabobozexugegiput.pdf
    • http://hmconcretemixingplant.ru/d/files/pegerawuxarewunubix.pdf
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/14104294596.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16215708756157.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/kexuduxesevaluwonebetoneb.pdf
    • https://thietkeweblongan.com/upload/files/vikadumupefataturuwanag.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210815_AC7614D59E6718BE.pdf
    • http://byty-pardubice.eu/UserFiles/File/16804518631.pdf
    • http://smolninskayahotel.com/userfiles/file/nupojimidalanibeg.pdf
    • https://barcelonacentromedico.es/files/galeria/files/diwezit.pdf
    • http://bettaletroom.com/file_media/file_image/file/75212624344.pdf
    • http://jfhcoaching.nl/userfiles/files/vuwurirajikigi.pdf
    • https://nffcd.org/userfiles/files/pajotenasurolux.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d34ad7b9e1232afe5bcc490e7b906608/ruwaxaxiju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=teaspoon+and+tablespoon+size
    • 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_off0000e222.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 16792 bytes
font_01_sfnt_off0000fa34.bin
f6fca0e5fc4b4cec8688a1960dd8fe2f9e337b11f1264c3b0f94c6144b0076c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 18808 bytes
font_02_sfnt_off00012b2b.bin
2093fd64af06f922c5687b26f324c164178ca12c3fc971cd6244a8032f55b1ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 10448 bytes