Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c36b989c5bdc205…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 17:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a92b88b8ea56241fd34eefb88821308a SHA-1: 1d767e6cb8b14c9920858f95320eb175fe19b431 SHA-256: 6c36b989c5bdc2052ea19460eb6219c44b93197644096c962ff1326283cb87a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=aplikasi+chatbot+android PDF link annotation
    • https://e-ceramika.pl/userfiles/file/sapijevoliwule.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fe9a4ef9cb63f8763a3c967c9e3fbc1d/38418683191.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/meh1ok9cbn9rafhcd9jn1f0jj1/51843855543.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/55319613702.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/xogobimaxuvodetujoredudu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161305d8377bc7---88291455725.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/54350028042.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/wegoxatabawegapumasegi.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/kosaja.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/94105408355.pdfIn PDF document text
    • http://skolky.info/foto/images/file/60900832582.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jekutipodi.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/sugujigad.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090209424673499.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/kikukafotajikosimoxinot.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/xowewomef.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/74456080754.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/rejuderaxonewez.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/zegeboxu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef6a358a7---38192840850.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/rasarexutux.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/lexiwujiviv.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/sasifiwobubobude.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/1986617920.pdfIn PDF document text
    • 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_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 17504 bytes
SHA-256: 972e8536a7273c92e70a554712011ea662350800c09c1c2e521375f5ed2597d2
font_01_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 10692 bytes
SHA-256: 2a517b22c718302e5c7de50c7080fa12fb0b18e6b65cf63c5f606b1858961316
font_02_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1