Malicious PDF — malware analysis report

Static analysis result for SHA-256 73595f78cf01c682…

MALICIOUS

PDF

74.0 KB Created: 2021-10-26 07:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7be687cf0dc02f2b647351a6ee66c73a SHA-1: e27526d39bdcc7ccd931612bef09d7a7d72ea539 SHA-256: 73595f78cf01c682e3950aa73e229333ae07bc8cada001222375ef82a78b1fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm used to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eminenceinc.com/userfiles/file/dagijenedigogilorurixonut.pdf In PDF document text
    • http://medeeatour.ro/mm/file/nozeguradifilisirizu.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/pobowuwudodosife.pdfIn PDF document text
    • https://etimes.mn/uploads/files/gaviv.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/2612066598.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/8288307569.pdfIn PDF document text
    • http://salt17.com/userfiles/files/zifafisadofomelisaki.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/podujepusifad.pdfIn PDF document text
    • http://seashinechina.com/admin/fckeditor_upfiles/file/2021102604081280554.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161556eb907729---95732543503.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/kemipasufasududap.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/19269354941.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/5498660651.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/8e4adb2f0c8fd890485c598895a8c306/78779240601.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1bd2f3690f05f9e493340cddb1a029fd/50236792570.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/nixiro.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/25830094861.pdfIn PDF document text
    • http://ranch.pl/files/file/9671915147.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616b143e217ad---52239115747.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20211018/2110181248025856912uxbgfm4oh32.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/minot.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/51075253628.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/sirulabogejogobifev.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/rotefadibufe.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/gisewanalunamufix.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=been+in+englishPDF 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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 9960 bytes
SHA-256: 4bc12365b9d555dcd3923404ab230973f7489e9b83049210ba5c1fb26896d077
font_01_sfnt_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 16508 bytes
SHA-256: fd10990cbcfc02adeca526b6290451badf89d923c921b6d4e48950b5c149581b
font_02_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1