Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21a33fbdf56b857…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 20:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99ec8153ad8389b51989d88263596870 SHA-1: e274d0b15160dae23baca048ec17f3a4dd2993f1 SHA-256: c21a33fbdf56b857569be80869e153e4975d99b23fd47f2d5a5574aee2809d02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to lure users with search engine optimization tactics, likely leading to malicious content or further exploitation.

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 https://garglob.ru/uplcv?utm_term=word+to+pdf+converter+offline+installer+free+download PDF link annotation
    • https://alajuusa.ee/media/contents/file/zuvox.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/lusunu.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/zupexoxiwepalobudalafugu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2d24938c2ea07ca9c46a63959814ddcc/46544934946.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c724a687---tikizupivi.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/jojedomakot.pdfIn PDF document text
    • https://arerp.kr/data/file///57890349900.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/drghmmlh0ge7k8uv6rdm2atl2d/76176936946.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc7f742c4---96795171758.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b42e7d98b---karawodisifigirev.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/aa18a380f6af93215e368b26d116f33c/lirit.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd5d0688c---remaz.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/11507933546.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/13851918529.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/tatefe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90136ea572---devomodowe.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/bigisivipomowipetetevudak.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506214851142697.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb25a5d0ae---nuvadevexevo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960e48f70e---xedolam.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/12000263571.pdfIn PDF document text
    • http://iphysiology.ru/upload/92437802925.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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 10760 bytes
SHA-256: a214847a24044504f8d0ef65308a155f7636913bcd8477c7cacd0c8fbade4ed7
font_01_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 17372 bytes
SHA-256: 112ffa56e26dcf0ca33fd7046e12e3d08b2ecaf5d147d4cbc17c53b6e733ff7b

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