Malicious PDF — malware analysis report

Static analysis result for SHA-256 852eb4d3a2375d79…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 03:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 56be07ce0d3f767ccf4e2fd2666cce7a SHA-1: 4d8abc0348833b6a1a846f819281e0654ab70040 SHA-256: 852eb4d3a2375d7903f80f8bf390f748e38b0cdcff12c82d2ebec2ac50ad06e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9975

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://youil.org/userData/board/file/46292046314.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pukowivej.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551eee5179---givowidujajejo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d78f74686---negezupuzudidageteb.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/10736612627.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2218c5054a---wefupuguvoxarimoledo.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/49853657766.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/mopoxugagiruvixuserefud.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/37089274182.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/vatebesap.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/gawuxiragurazubu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/46f68d5be999b0ccddae45b4e8308d35/tifomutuduvigi.pdfIn PDF document text
    • https://istanajp2.com/contents//files/83720360659.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/36692994870.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/favefa.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10a0b7d988---jowemoropuxi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a45beff1---jidawele.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/68758391991.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b0bba9ed---fukugaji.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/p46n2fj948mr7uto87drn9e0s9/duwipizanix.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a33925ec391---zodubenikig.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/55002814232.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c4af8305024509c70afa1c87900c0a29/kepunatidutebexe.pdfIn PDF document text
    • http://indemo.pl/Image/files/40109739697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=howard+miller+accuwave+ds+625+205+manualPDF 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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 11220 bytes
SHA-256: 652d6f8ff0e0176c483ee3ed18b6ebac724c1dfc662f7e018c2423e657e1c5c2
font_02_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 17132 bytes
SHA-256: 239c69cb751b070a399b5c6bceecb9d2a959adba316d034bd6a463c92a9b8f17