Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3941431f28dd417…

MALICIOUS

PDF

209.2 KB Created: 2021-07-26 01:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a7c31bd9db94593898d4e5be8f3e1b9 SHA-1: f148d3339a224d4792e66864cee101c1fabb21f2 SHA-256: f3941431f28dd417d68d2fc858d1bead215ad2c7c925db9b75e9588e0dd6433d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs, many pointing to compromised WordPress upload directories, suggest an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9509

Heuristics 5

  • 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.
  • 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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d7afb2c1b082c1cada3181a369a9011a/70736591866.pdf In PDF document text
    • http://kirakuramenandsushi.com/uploads/files/wakopofogutagoxeseku.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/19c60377004a9fdb6cd6a2451a7781c6/ronewoxodekuvagaselokabik.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/zilanobomozapinemedod.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/e3g4rn664cq46hgaill0csqbl4/39983211938.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/t65714mb76jspf6a5p8bkedch4/waduxikojono.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2574d464---konod.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/shfjjmn62dovgc8bitlueo7jjn/sodevogajegewusametopiru.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/98902307778.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/nkdhoah42hitjsqrbmj4k5jf25/busujilidinen.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cad378a271db4d2d711f918283ad21d/74826251526.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/89595279671.pdfIn PDF document text
    • https://papiratisk.cz/soubory/merurinejewolavobe.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxixivemurokusureligi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704539f2088---wubapopu.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/gasukoriwosurorefat.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981dc17de1c---kemutezubiderupakuradib.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/89ea10139e80f8d329cc2641076d7b60/17258455873.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a308b8d312c7ece72e89ac71373a0e34/jopumugaku.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8364b9622acf2bbf67e845ca452b6703/vulajo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/140141245.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/chlkdlsphd2i7sfhi4p8hrrgn3/58438119327.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e7fe9173923c6e92b3e27aa672059875/23716430164.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b651473c4a2---janokenifusokazamiwozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=calendario+romano+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C2B8 2696 bytes
SHA-256: f1a78dc3f62ebb66428e72a3a7039da27093b98c6734f022f75eb94a7812b7b1
font_01_sfnt_off0002ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE19 10416 bytes
SHA-256: 4986272bdd90200ad6e00f3b78e895d99cb3047c127120127eb2f81f0ef37d3a
font_02_sfnt_off0002e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E59B 24448 bytes
SHA-256: 457f3dea9020b37bbd39ed94fb38e8df85bffbdc4b0ab2d3f458f12464473c32
font_03_sfnt_off00031c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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