Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1feb06dd0b4f4a…

MALICIOUS

PDF

104.5 KB Created: 2021-09-06 23:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 8cf0200e1506f98e26b4a66cd6a8c2ab SHA-1: ae72c3a7ffe58c6dcd6c7e337ff4d49e54eccd6b SHA-256: 6a1feb06dd0b4f4ab24a7a70b6be800f667f8bcc72a8f04b81df6dcb89ed4047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://drishtinetcom.in/FCKeditor/file/numusidipidesafoweweji.pdf In PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/19218869253.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/68671217391.pdfIn PDF document text
    • https://andrejc.si/files/file/71648972269.pdfIn PDF document text
    • https://laps.pl/userfiles/file/xifuxos.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160797bc72982d---52429847034.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/kodezib.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/trfl45rv11d1oep3hmt8g8lvh9/23502639852.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/b4lce9egkv2m8f00und45cvet5/vawezagizazo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c288ea1d2---59351741636.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3e7d48e6---tesukonekuxaw.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770a5ec2b78---83745211201.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/feb1589e2b1643968543df8e15e0e8a3/rikududol.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160997a82d3124---11617896504.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/lekij.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xilotamolofelesenokujur.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/mexonikolaninenede.pdfIn PDF document text
    • http://pronobile.de/catalog/file/79316079025.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/medufuguwuzepagozolunido.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/tisozedadamigutewugujo.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/60726749791.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f3462db76e08fc3ff9781a10de94c618/sifolofomoniri.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1eb7fa7643b55f2f119c575b06cd31b5/jerewafilovomufeve.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/zetexukodenez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=student+attendance+management+system+documentation+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001340e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340E 17600 bytes
SHA-256: 9036368c6a24846770a5b6ffb172f17f104e8cbf2fc0aefe6d2c2a40683df62f
font_01_sfnt_off0001619a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619A 11108 bytes
SHA-256: ac8d9baeba10bae9a4cd1dd5bf2f8e40b815c012aa8664f49e591ded958ce44f
font_02_sfnt_off00017b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1