Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b241020633ac41…

MALICIOUS

PDF

86.4 KB Created: 2021-06-20 11:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 233428fa97a3aaa436be511810086dab SHA-1: a8754e2728d0dd6b4accbd82b30f596e2bd03dfa SHA-256: f0b241020633ac41d2573c01c8db0fd1561461154e2dfcbc4b10a528ec4420fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters and the use of 'formcraft' plugin uploads indicate a coordinated effort to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=holy+bible+free+download+for+pc PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707d08e9b9c---xopegiwafoziduweg.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/xitobilisanuwiserev.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/177a8024f08cf32493f7bccfc497efe4/kurenusunezimipa.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/lidegekenu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e0f85900---80794201930.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/68552372215.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6872df53---75948881819.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92ff55e712d377ea11520bdca6efcee7/zegupijugigevowaz.pdfIn PDF document text
    • https://majubesar.info/contents//files/punelitizatuvagisowipuwa.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10ebc13d9---79571819104.pdfIn PDF document text
    • https://medtek.vn/storage/file/fubukapigosiwakemugizu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076346882e94---luwosa.pdfIn PDF document text
    • https://people11people.com/uploads/File/90590219142.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 11184 bytes
SHA-256: e4c09cd78a8dc7955f438d7a35c12d0fa90767021958b01385c2d3bae2a127ab
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 5268 bytes
SHA-256: 3548f62825ac101d40c901dfd3b4cd173af1ed421e45aecd7f01985e0fa20a5e
font_02_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 11448 bytes
SHA-256: 2e569b85136c3d845ca0efd52892a4a30126c279243a8736f8d596979077d119
font_03_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 16204 bytes
SHA-256: 70d286a96435f9e1132771529d7b3d79f51b61ea3a89d3ea2c235474d063bf78

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