Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e07a9e133998e3…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 06:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1076513fefdc012f62a3010682ec6382 SHA-1: c0c46544076ad8e6dbd73807af6f9342f43f5a47 SHA-256: 38e07a9e133998e31e05a6219ec09a07fe1ade6621d27ce0ee14243f608d1ad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains multiple embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lidiyageorgieva.com/ckfinder/userfiles/files/vixatupitanitefenuzusobe.pdf In PDF document text
    • https://masukpt1.com/contents/files/67839533351.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/61810711347.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/tawulix.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/fefaxumivekapodi.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/xotagavagatorasuv.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b349c59b16---47394417999.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/17020964223.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/rejanuzubuwupefipotom.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210917093027.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba03d099b9---rerun.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/zurebowaw.pdfIn PDF document text
    • https://suruburi.net/mm/file/xanikezo.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/mikutubikekuvinowoderiz.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/tagibipurew.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/fosonixabo.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631123783.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/kuzujupelumowarolase.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/43540177306.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/lamupakizujowidibux.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/bimabotemobazitanidag.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202198210416988.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c10726e04---fuzejavesipifeli.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/joravatupolesotitoraditub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+anime+app+for+android+tvPDF 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_off0000c079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 16308 bytes
SHA-256: a2f2191eec84ad80828d611f989d7637448de3c967ac3ee5730521ba7e612f14
font_02_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 10732 bytes
SHA-256: ed06458b37559d1f091d65a913a17b484621cb03196d0ba60611451551474873

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