Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1cd2fff2f9471e…

MALICIOUS

PDF

85.1 KB Created: 2021-08-15 14:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 24f03a138ac479e44b8959d718eb298e SHA-1: b129e2e9edf79af6b11cedfb07850d0cf41efd49 SHA-256: 2c1cd2fff2f9471e12de38d9a6e753de8dbfe5d054df84db208fbf06ac070f2d
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 https://drafthe.ru/uplcv?utm_term=why+does+my+juul+keep+blinking+green+when+it%27s+dead PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609661e48db11---25840497384.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/kiwotelaxiwifutoweruga.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/67790691060.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b957c1ad6ef---49091508545.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607594933e274---jafaxadalam.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/2156449715.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cde7153ab---devetijolalejaj.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/89168192576.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/nezujowedarefadogusi.pdfIn PDF document text
    • http://pasted-radio.de/web/files/96918350382.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72b12cd06---73463021797.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/698824052.pdfIn PDF document text
    • https://soechi.net/userfiles/file/gupelewat.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f59191fa---63417089099.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/vutigupasexubosix.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/70608724335.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/aqd86ne1ce0542256adrs27g2u/voneraku.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/25831625327.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/29192020155.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/luwivosanoraku.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/83090599793.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/67ec37f14e1220ce2ac62c01dcbba796/24287780799.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac076569feb---nijumamaxufu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/509qagrj27puo3eouh4h0apkrd/lamibem.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/poligasapafebidalavesebo.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_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 16564 bytes
SHA-256: ab1af3025955ff8dc96b42532d087aab157e0fc1bd8c013b74e6386298f34f76
font_01_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 11528 bytes
SHA-256: 625a39fe4dc46e18f66bb43e5560de16f635b9324dfc66c5e659957a8f64af70
font_02_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1