Malicious PDF — malware analysis report

Static analysis result for SHA-256 37929ffba54997c8…

MALICIOUS

PDF

85.8 KB Created: 2021-08-10 22:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 70a9f6ebfcd1c2498a61448a991d07af SHA-1: 731415d3c75a552945d453523ec0b1940585db9d SHA-256: 37929ffba54997c855f6cf1b052bbab868723422caedf16879720bcc5663926d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or link farm operation. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=les+temps+du+r%C3%A9cit+imparfait+et+pass%C3%A9+simple+exercices+pdf PDF link annotation
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/7842d346c30995c69730bc70b677c443/85290138502.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/raxabaxulezitiwava.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3fd44a99---gageko.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kujuloxagi.pdfIn PDF document text
    • https://aokman-drive.com/d/files/satola.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9f4a65c062ebb162fcfd1991a607461f/bowuxotinodomigadu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f634d24d051bdbd24b53921ae88f44fb/81763934695.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/43789811660.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/4v3t1kcpb11f43agaooi94mv28/29986939482.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/bbd4f59f425b9ac7ce8987632a8a9427/bibadiligezapa.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/97554619647.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/l1i6u069pfq4jng9tcisl5htbq/tasunefiwofe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df623d4acd---2449904124.pdfIn PDF document text
    • http://allycatering.com/userfiles/rewabapetelizuj.pdfIn PDF document text
    • http://sciattella.net/images/file/24451412225.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/91727316487.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/11507933546.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/41113290220.pdfIn PDF document text
    • http://mobitransjogja.com/files/dozuxulese.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0cbf16c99659e5fffa44128e09589c0b/jixosenabepoj.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/dalogaj.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ec629b7f34846c6c07505dd6eaf9a8ad/dixuxenefog.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609631d1cb4b9---40997552478.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_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 18936 bytes
SHA-256: 0c861753ce07cf5ed5c3f1fcc111ed2274a0d99ad2f2da559603174c7abfcf64
font_01_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 10872 bytes
SHA-256: c2c8b2b47ba61e44a8d8cde3956a3becba8b44244209af34f7a38acfd118d297
font_02_sfnt_off00012e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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