Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe28e134e3c03c1…

MALICIOUS

PDF

82.6 KB Created: 2021-07-24 11:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78070234e962e450a94e82ac059c6a40 SHA-1: e6f4a2e75538081501956a06cf207fa7bbdc41f3 SHA-256: dfe28e134e3c03c1d3226892a06ad5ef3fa4061bf51c3bfa3f6bdc3ec1c8d9a4
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other hosting locations, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' in one URL suggest an attempt to obscure the true malicious destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef2ddf1e88---90474857635.pdf In PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rozajutisapod.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3e909933424a088892286738c2a17ee2/kelawiwuxazorupoteje.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/dotugubulakifej.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f1cd14d191531063eef915fbc2289dd/buvevipipegi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fdd0d306b1782b99d029d41e6415ce1c/92266336200.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210624_E874F471F0063E73.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/57528601732.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/8649902322fb9dcacbfae250852ca060/78967345380.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f371be6e1---47316683536.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85392e474d---dowuzav.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/kinazukasaxafovedon.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0b299c77---gukunakarenosep.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lqgasufqqsbv7frd0hd1g4ok51/50039838823.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/76349828226.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e215e93a251---sikowelikag.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/53628e0772d5d9dda9bb4f4436bb58e3/89122779431.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/savipifujezaxajatepul.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd4ae797c---zudokawazowezupiz.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/60183513428.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160808af0ab02d---xawuraramojonabovakud.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/77452296971.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb18a461f---6429942400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ban+ghost+win+7+32+bit+fullPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFB 18724 bytes
SHA-256: c908191c8126525ed1a3a1f3a061f6d8b26d3ec6f85e6f60fe0b5eacf773806a
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 10980 bytes
SHA-256: e04a5a3834cf544f28ecdfd332e0ebdde25b2374b580bfd78c1cf25bfe726cc3
font_03_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 16384 bytes
SHA-256: 535978292571bf09a1a92dbc5c72e5a3a13a3df038d17f015572068adefc64be
font_04_sfnt_off00012f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 2396 bytes
SHA-256: 9b28527f224130d136ae9c0af79c13d04f638c94f2debe59eea7558e88a7c8e5

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