Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6c100302f4d0da…

MALICIOUS

PDF

87.6 KB Created: 2021-09-14 02:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0f085cce1786d21f7e1fa396852a761 SHA-1: 3657ec8f55bcf66fe2e0c5ec093e77b76d7dc7f9 SHA-256: 1f6c100302f4d0dac6abe7330515f96829e048ecaa9cad22d4254796c5f5b917
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs, such as http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344116054f5---tepevinubiluwevawedegofog.pdf, are likely intended to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://goldenstarhotel.vn/images/uploads/files/fewonojubagizazofoleg.pdf In PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/97584608834.pdfIn PDF document text
    • http://namngonviet.com/user-/files/lovoba.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/ponedowufux.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/25801245623.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344116054f5---tepevinubiluwevawedegofog.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/jituxujijakukojadenulij.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/navebelidijujaravobodutu.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/93479828849.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/febewonuvokefugotaj.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/706431717.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613886a894bd3---xipizekoketadefemilur.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b363c07bf---pategabalirulawoposulu.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/rukafaruxexisejib.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/97841013624.pdfIn PDF document text
    • http://naso10.com/userData/board/file/merewekugewukojujad.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/57894185272.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/ketesitupuga.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/45804737869.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/44902870660.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/powejijemazolub.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vhgb39libd8rb1a82ptih247s4/jumizoxaluxokasikitogorek.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/9830264797.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/51b358ba5fea27942134e13dc1f881f6/rivawadugiga.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jekededajinawelevizefo.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/lulexekigosetojilatop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kingroot+apk+for+marshmallowPDF 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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 10844 bytes
SHA-256: 4ee0bcfe34c0338897b36d34bb9b8ff6b6b5c0cedddaa9ac5a72b4cfc23d84d8
font_02_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 18584 bytes
SHA-256: 0cb698d6bd6d329ae9d114eb65d691d616f4c011e06506f3c51c31b26e252998