Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c4fb37ee6ae0a9…

MALICIOUS

PDF

90.7 KB Created: 2021-08-26 01:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc5c2eebf7b57d578529e003ff6c1092 SHA-1: e7628023293fc27444ea426d6d6fa2fa129b704f SHA-256: 06c4fb37ee6ae0a99c60535c028e246d4437326a4100dcd8a4584f67fc17205b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised or disposable domains, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hebammenglueck.de/ckfinder/userfiles/files/17468172122.pdf In PDF document text
    • https://minlinart.com/archive/upload/files/40385047227.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/9274802794.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abcec0f6f---92842254195.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/73780722514.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/zujare.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/52873359790.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/tudowofaxis.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/99222928329.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985eccdb4d5---keferir.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/jazaso.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/kuwenujasa.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/11308387968.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/4148187274.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/84338481520.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/79818293462.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897174d181c---50309619820.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ad3833e07---fidumitigutopixeta.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25cf96553---pezitezab.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be461ec36---woxumetemifaseviviweroriw.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/79662e7680159bf8f10c1ea2348c8a11/74654872922.pdfIn PDF document text
    • https://digireg.se/upload/lavelalofakofewodi.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/mukudesevusitevomegoli.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b0ec6efc3c9284ff7e6a81e531453e4b/95526099763.pdfIn PDF document text
    • http://rc-modeller.se/images/file///39312706728.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/slhsfc6lldnqjh7hfk62b6e5ij/xetatilifez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fraction+to+radical+calculatorPDF 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_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 17392 bytes
SHA-256: ecccc8d8e586e6638a1ba912676ec9a8ad2a07b7c873942a8626b9b130369788
font_01_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 10140 bytes
SHA-256: 66d404d964dfe640771b386f44f634d05bf14fceb7847dc4a8a524379156775b
font_02_sfnt_off0001442c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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