Malicious PDF — malware analysis report

Static analysis result for SHA-256 12833ba873a3756f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 03:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd251d720d255fff1d55c06ee0695c13 SHA-1: 855a323eb45ccc7b065605b422d3aa1bba75fffb SHA-256: 12833ba873a3756f7365f7384c62f044d854a4ebd36f4223708d9038cd412e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URIs and the nature of the link farm suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=ultimate+star+wars+new+edition+pdf PDF link annotation
    • http://kelvista.lt/images/files/mowetokew.pdfIn PDF document text
    • https://oasis-travel.ro/files/70555667861.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/fojunakeda.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/068e3487a7ce8109c9cdd6d2659cc5de/40849058140.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/zadatolekapan.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zokadavipigemazog.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xolizogopobez.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/8204898379.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/938095d858445da21117d0d93e95e865/2070723330.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/812dfe1b6be80d1863e6c424672f0ebb/72223429241.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dipakajur.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/ruwugovanupabotezoli.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/kokibukirodamijujone.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/rilanogif.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615344bf7f332---zufojavu.pdfIn PDF document text
    • http://freeorden.com/media/file/53800529349.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/90293203298.pdfIn PDF document text
    • https://angkalaris.com/contents/files/94575951611.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/63643383024.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16019246585.pdfIn PDF document text
    • https://granitnet.hu/editor_up/juwiginat.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d6522046710635afcd591d113309ed4e/33184932723.pdfIn PDF document text
    • 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_off0000af32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF32 17272 bytes
SHA-256: 4bf95982431cab9f87147945a2f31522507c24fbbd9fb86dcbfbc5092a18a753
font_01_sfnt_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 10752 bytes
SHA-256: f3b6c633d66d7462b8a30d1c8ce46f0a1db6a562769d619501af580bcaa028d0
font_02_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1