Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aeb3b12683361d…

MALICIOUS

PDF

77.6 KB Created: 2021-07-08 00:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b690259f1dde3c44e96db84d04174444 SHA-1: f4302cafdaf7780eaa44c5c5ee3b03181af1c626 SHA-256: c1aeb3b12683361de783a5f4374e742e754b5dbd7d926159c80a5e6b2f900ce9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous URLs were extracted, many pointing to compromised WordPress sites hosting PDF files, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cructi.ru/uplcv?utm_term=your+love+is+lifting+me+higher+chords PDF link annotation
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a295550ba---magonosa.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35c48d0c0---36948430970.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e73a4f439---dosukexepabunadupib.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/megifuxifebipulag.pdfIn PDF document text
    • https://webmenuplus.com/images/file/16471372434.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e0e4bcb58---damasutupofiza.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081213ab9fd0---53200104182.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41444529e---bazoteropenetuwatejedi.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/witukonubiwegu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/41852757723.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/6817696478.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/73315933992.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/4826410821.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f7843b4ef66c3a95f4bddb44a940edc/zabekejiligesu.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/8h1cspdh8qvhsgl7a5lno65j9j/39042952403.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160744030bbe57---nibubiwusolilazasilepojum.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a23d55f803---41981638037.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210625130405.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/70qaikuk0u79r8m0jhg4alco2g/rovonagavo.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ruworoluwebalujeg.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hn99ki5aftsc2ucu1hksosed7q/45859730123.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/75096712796.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_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 10908 bytes
SHA-256: 0748aa2309b422892a7fafc381297e6500701e48a5c80a3304457dcb12cadc61
font_02_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 16748 bytes
SHA-256: 67691b773efe8cc03ff5e91db9e832a78e485f9388025f25f2ea950b1506c4b6

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