Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe3e5eff5230906…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 04:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f173a2d0bb9994d3846d522d7f41f9c SHA-1: 1206a2f7c9183e3de0cc57c0cfa02b5dd34c3d87 SHA-256: efe3e5eff5230906f4be689ab27ea8fa7350655d4799b3dcef5f86a4ab7f2ee3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The embedded content appears to be malformed or obfuscated, preventing a deeper analysis of its specific payload or exploit mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dailygameresult.com/editor/UserFiles2/files/79846471253.pdf In PDF document text
    • https://alpinashop.bg/files/laruvav.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/risofizuxaxodepaxezoror.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/pupivebusapoworur.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/713d2846f356ee6dc96d718ac1357954/xutevola.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b4b3821dc---36852091612.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b8955cad7302ec09eae67d9697022209/mizobeveduzelexuvuwefize.pdfIn PDF document text
    • https://peterdegendt.be/file/84556766522.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e07a13473---9661434605.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607de31fc8678---wupoxokugojazak.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/pizunotuwifowatipovelina.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/valigotanarotojowuz.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c72533b58c6---81109069301.pdfIn PDF document text
    • https://ocw.tw/uploads/files/47839109887.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/fb69c435278f50c2dc2623386decfdde/mikolisagev.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/zowisawis.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0g2lv9gaf2dl913mc3kh9cg67q/tudemutufunifatigesufaj.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/uak1605kobbh5rkgb4sdggv7mm/gojopizetobofi.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rifupal.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/nalenuribo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fd2ca0252---4575779757.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d87f1971---29256671229.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21a6ba75b4---31245435338.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/sozewovuwonugunibupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dui+banglar+premer+kobita+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_off0000bcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 17000 bytes
SHA-256: 38e8223a5b6fa85cb66d7909e17d1dc8b5025e72187d3edd080e8dafb4c31102
font_02_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 11004 bytes
SHA-256: 08bf966811025993de58a684bc5cfb61ce6568cf79a24d631e98ffd55d93107c

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