Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e7905bf10edddc…

MALICIOUS

PDF

71.0 KB Created: 2021-10-09 20:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 160b15ced5959519ff0ad411bc520656 SHA-1: a8a7e0a5ac93c3bfab892fa0d62d7bc9496b0934 SHA-256: c7e7905bf10edddc68460893fb8b16e3f0edfd8c1dc196e73aea50ce8047d6ef
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://kondicionery-vidnoe.ru/upload_picture/file/54697450582.pdf In PDF document text
    • http://encino.kopanramen.com/uploads/files/41223382356.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3d2e253a---79805333680.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobapa.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/xumaxujoludejudutasunuxak.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/tomudev.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6e77d095c---60969767815.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7f69b6a2d---jokibiwuvekujofakawowasa.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/26959336182.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/ponevadubijixunubeg.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/82803030499.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/44771002819.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7b6356a962db6400fac5d18dd68ad013/zorutijutazitiziparujomi.pdfIn PDF document text
    • https://polytex.de/sites/default/files/79584145116.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4vsp321kj2o2lim2j9ft1ln5ro/kekapimurufopiniwegukesa.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/25658057405.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/xujevotowev.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210921204549.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/69388214268.pdfIn PDF document text
    • https://santeh.md/img/files/73170061928.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4eccf3536---suvisabizazubuzebodozozad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=components+of+scanning+electron+microscopePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB563 10852 bytes
SHA-256: 116eb1ad82a70e931b100e44184bae0a97f3684a1de15163f7eb0ebfcf631659
font_01_sfnt_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 15236 bytes
SHA-256: 38273721e0ef8d52fee4fd2b8191763c9f37a46dc9c4bc7051b22ae997654114
font_02_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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