Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27014ab05bf13b0…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 17:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a83184795bd0b14751e957e8792efa96 SHA-1: 2ad1a2a96edab2b4fa9b56d4ad04e71bf8f5b2a2 SHA-256: c27014ab05bf13b0caf5060e54adea3ea39f2ec137d93522dbe4419a340af268
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=abdullah+ocalan+prison+writings+pdf PDF link annotation
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/dejasurin.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160803b5fc637a---4977021873.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b57da651825---70662001691.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/b4dmdsh3fs50rehi84sbb7cnkb/70737427960.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/57789591096.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/74804451356.pdfIn PDF document text
    • http://rongqichem.com/upload/files/ginadulewuvitotek.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/xajapu.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/wevof.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/7384433101.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/ralilobopux.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/pju8br4f9s596rkgl5ru614vvt/sigilajomivevejufasusaf.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/9171734440.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c910cb9d6c---86729452702.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/zorazuxofobafavisamuli.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a2920e8af47---80839883614.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/070e12c81819f7d1eb8b35978a5e0bb2/daravanijitofu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609496b2846f5---gosimabadig.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7ccd43f92a2cbcd171cfe1febf86893/mivebefeguzoxogimimolagax.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d29fc3bdb05---97713611339.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c3c0a5689---80474859222.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/jojodo.pdfIn PDF document text
    • https://rosycaffe.com/file/55317346680.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/26d973bd75e9330466e1d625d044b546/99820407540.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_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 11076 bytes
SHA-256: 2fb8df86bf2375a7afbaf48f434397798b9738583537c7af4628b02cefeb8e0f
font_01_sfnt_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 17408 bytes
SHA-256: 3ac0f1f49e13dc69c157bc948f37750c59b9ba89dd40c4a27b3c014b6bfc56de
font_02_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1