Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02f4cf3427ccbdf…

MALICIOUS

PDF

82.3 KB Created: 2021-08-16 02:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 595ab7decc3ebad687451e90951acd75 SHA-1: 2afd091a6209857b16dc05f048231db7055a8029 SHA-256: a02f4cf3427ccbdf8276a63dc195603c740fc426236ad9b9d5e79f7ce371a422
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to leverage disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://podwierzba.eu/ckfinder/userfiles/files/fukazumivudopazevugired.pdf In PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/f22e426c66fe06cfe57b28d33a5dd8ea/6925630930.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/63477859225.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/95d60b6fcad0aa31c663f74ee6e8f271/92568892776.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/xogovarowomelosaxoxe.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/bogezirolejug.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b1dbb64545072814780eb638b3339eed/govet.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2878aa997---kojofaj.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/63552346557.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3e801801a972149007595a9aa5fe1b5d/somulumera.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1uqlvjhaupe1bciovsvvrf44m7/68793996311.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/dujuwuxutadodad.pdfIn PDF document text
    • https://sbufficio.it/file/29275242479.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2254c16ca2---19374706486.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/79092429465.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a55df1b14---gabijuto.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/73777856607.pdfIn PDF document text
    • http://brukbet.com/user_images/file/74885513626.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/22355267792.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57999273313.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/2602883335.pdfIn PDF document text
    • https://artenika.pl/fck/file/numuxaxozozodoruwubaniwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=weekly+cleaning+schedule+template+pdfPDF 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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 16640 bytes
SHA-256: 6755327a9d485382ae0e2fc8114f3f399dede2722487dd876c76df3f9273abe3
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 11148 bytes
SHA-256: e0a5c8914c25dfb6a1e779ec4aa61b56e559d652bc93f4bde0973ed9b1b9b078

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