Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c62f337170ab22…

MALICIOUS

PDF

89.2 KB Created: 2021-08-12 00:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 839950dedf32d00b68dbf137e1ce8ab9 SHA-1: 9ee9162a8803617907efa09a9b2de5c892fff157 SHA-256: 27c62f337170ab22c6cbc9a4db3300e449196f78d115a92d1b4b1592e5fe086c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ff8d4883---durirekideduruzabiwi.pdf In PDF document text
    • https://davidfoleyinc.com/userfiles/file/xitisufed.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff414b8f2a0---tewum.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bc5036d4175e50db82eb55423cd64a34/xalonexepaziwubef.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43db37b35---91125311485.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/vufaxixalopevodomup.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f9fdb97649bf675c0b419c992dd4fc28/kiminokuxunexu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/302f8cbbb57250a1d49af307b6cefbb6/liwiwixazudalirakifadomi.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/takademapajusazepiji.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9180ad9b1---81227094870.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/sawud.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fb4babbb9b0a23b5c87060f1d32cef5d/tanunobegarerewaxemoxarol.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c6eada63a2632846b54a6d7d6b477417/basetila.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/wosevurijilidajupoz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609b294fadc34---dozikilosu.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/bixumexetonobosomolujiver.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/patawujubomojamizoro.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ed8d8627---benidajowarojimomusibu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16080d3420feaf---76894520628.pdfIn PDF document text
    • http://vhz.cz/user-files/salitakejoxup.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/oov8s3leuq33pe80rhlcrguss7/kifejije.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/tesilibabevub.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/palelifabibemaromibi.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/salfhcrees1elb5spqo8nq71b0/mururufemulasuxilalikam.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/60d77eac401c2a7ec70c0228a0c71101/xunudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dibujos+a+l%C3%A1piz+faciles+de+copiar+animePDF 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_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 11292 bytes
SHA-256: 01536f059685002eb202d8fc9a739c4eb976d35d397ab186dab692ac672f8dc5
font_02_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 19860 bytes
SHA-256: 8e064ee409979a210e9d59ecd56484c462b961d4e280983cac548387a5c3bf0f