Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c3e4472947d5d1…

MALICIOUS

PDF

98.3 KB Created: 2021-08-05 13:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c13357b9d1ff737bd5a55ea2b3dc0201 SHA-1: 842cd0ac267d106007bb17011af4b87b676ea5b8 SHA-256: 73c3e4472947d5d165d3ce59c45c21e7bb8ca60a70f030033c8b4a77923190c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised or disposable, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure as a link farm, with many distinct hosts and UTM parameters, suggests it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2acc52576---kiserebabisilozegan.pdf In PDF document text
    • http://cancunday.com/travela/img/files/75393262102.pdfIn PDF document text
    • http://iltorg.ru/upload/file/57198828463.pdfIn PDF document text
    • http://fygl.net/uploads/file/081215564738.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/r4f3rkv1l845l4bhjni454r8h0/74127104042.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/kifurovo.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/98335811074.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/kaxinoralogewamibetebuf.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/wisuwerojifudotimepud.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/jipegupapupomoji.pdfIn PDF document text
    • http://toonesk.com/upload/guxigegapoled.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/61090017177.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/llip1d73eul612hg4r6os0ic83/26512203232.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/33705584543.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zizeda.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/fovogokafe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2413c3d77b52b5114433326aab1fe1e7/59124356723.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/86814682402.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/kiwokuwuxofolesilore.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/117695637160a94ec54adf2.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/c84c8efa70c846facbc7127f40051d5b/katumogilex.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf5325fdc---28482731564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ejercicios+alfabeto+espa%C3%B1ol+para+extranjeros+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_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 19228 bytes
SHA-256: 6bb7b1d6b24cb3e2a55ee79300a00b6d1a4196d95d10193776f15e95c1c003fa
font_01_sfnt_off00014658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6F 11176 bytes
SHA-256: 606d5239f02f7211924439ead94e73251f0ccf066cca0c6ecae89f061b68631c