Malicious PDF — malware analysis report

Static analysis result for SHA-256 5937b2c2e2aa45c7…

MALICIOUS

PDF

81.1 KB Created: 2021-08-13 02:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be79fafd464c0b1469ad7df9ff65173d SHA-1: 55d7f4d8a1ce75ee21de9011c6bb792675501fcd SHA-256: 5937b2c2e2aa45c7e3a8f6a6118ac481668cabcceebb1669b2305a655e7f34e9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple compromised CMS upload links suggests a tactic to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/es19dv3ravsb1e40a1ea20bv4q/xakokuxedati.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b01b20ba5dd55d5282f5d0c7a438dbab/zurozexozatafajokuxetam.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160748c3c55bf8---73472425065.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b969dff8---63869708492.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cd830094b---fukikamuvejul.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ef1f4718f0f33459f3a67ca79cd5b1eb/34229868030.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/112af384c526968d2fc766f6509805c7/fozewapololevemevamebodu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce8c0bd419---20688546246.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vanopevajidaka.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e3c9f6da---towirowewulupumetizov.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/31890577195.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/bexemuvodag.pdfIn PDF document text
    • http://4rrecycle.com/files/file/93775919766.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/daxapune.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f7b8c2c9f3ec572e68bc8553d177e422/46804955957.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/22607e79298ebd22d0430db4da1dc763/jegot.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992af903039---mexufatojezulow.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/budejukixapivef.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/44235948329.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/gepedumi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075d02058c05---bujojewafudawevitakewux.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pawaretuwaranexezereg.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/kenejaxe.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/xosumawabase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pythagoras+worded+questions+worksheetPDF 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_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 11020 bytes
SHA-256: 0dd1ff91522afacfb9ea2e675d23ed6cef816319d59b22401183033b7b68c3b1
font_01_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 17324 bytes
SHA-256: 0e3d6edea4967996c7f4811bd5ad96ffcc762edd78a593bfe5fac9955bdb2351
font_02_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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