Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65f99c239cf6d73…

MALICIOUS

PDF

92.9 KB Created: 2021-07-12 17:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 814608c838f3e7b27796d0b143b1c7a5 SHA-1: 7e846feddfa56450c87f9c41349231aa3f27d79c SHA-256: c65f99c239cf6d73e5ad57bf360e5cc25027530cc89bc34b60d0fbe4a9478dcf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://archism.ru/uplcv?utm_term=congress%27s+plan+for+reconstruction PDF link annotation
    • http://yakutiaprime.ru/SITE/files/editor/file/51819329388.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb3491e98---36287262705.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b754635f---gexodetit.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/5596193509.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/oec6drd9culom15in05qei1jts/37394714838.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cd5b4b90e0a5aeb97625e713d226a7be/xonozexikidumikova.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/minajobovabexer.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/53336164894.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/52480284363.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/vg910fd91du7vcm50lgvrhbkuh/39512890991.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090621320029---78815612543.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/xegupuwufuridowepefitew.pdfIn PDF document text
    • http://grimastone.ru/files/90488051044.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6936c4238---36255979477.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3462a39704---befivorapuxumazoruzok.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/3ueocmc59oasfh4rp8518i537t/56864556240.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/e3265954ac58622b53b44e99081ca796/zorosorovov.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e214f1b1439---58069540661.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/norud.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/korirorugipubobodubi.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/4330724355.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609282a59a549---94048000046.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/40178151806.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syIn 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_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 10820 bytes
SHA-256: a9596df493652b4a57796688d5c4745b213013dd7c81f178394290bc5e3c1f39
font_01_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 16252 bytes
SHA-256: 0828cddb791c26a1446f7b443ee888679d2ddce4c905840ae7c8e05b851ccb06
font_02_sfnt_off000154d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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