Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e735e4d20a5cc6…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 09:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2cd73d3ad5d17a19d25989e94930101 SHA-1: 762afe94f1d022981d908b807e10b10a463c34d8 SHA-256: 88e735e4d20a5cc60d32d12b9b7737b26ecb591b37e1fb08c8211d12d4c04d5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

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://ddshower.com/ckfinder/userfiles/files/98546256955.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e6cd443db---51010916645.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/rojidiperuxipasipejax.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/depalulebigevitos.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d107bd8a3b---bipuxasesevetuvumasulotes.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/10070571527.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/57703382460.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d253d796e70c9c2b502afd15f97c07b4/tamezopeme.pdfIn PDF document text
    • http://flexa.cz/docs/file/20329110316.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1241cb4c2---lilowalifuxowidarudis.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d247a6c3---15284508058.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/22437653803.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/pu8q0sf19ms3kaododiejr3re0/39114152964.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/xivovuka.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/puvozeb.pdfIn PDF document text
    • http://bakoca.hu/files/file/60293699422.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abff0aa7638---97964416371.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5eeaa89e3516e5ee5713aecb216e7b90/82078175714.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf224c61ba---litetalesulexas.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f616bd45d0---vavofanulitokifigulu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ae8ba4b2---11602002945.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/vusulimurojejiwazuzijiw.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9k8cj1rafcii82uq0sblbi9nuv/rubulumugul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=from+ashes+to+new+hollywood+undeadPDF link annotation
    • 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_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 19060 bytes
SHA-256: 2cd85c22ebb0250bb51b727be30b47e883e74e52613671ffc3b76a9b937d4b55
font_01_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 10696 bytes
SHA-256: d29f0ec3118aad1c611e6fd6bddaf8841d1f5d6e6e530eed657df6410b7eef4e

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