Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de8ce47c2478f88…

MALICIOUS

PDF

78.1 KB Created: 2021-07-02 19:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 44dda5eb51ad8a437d721865e7cbd74b SHA-1: 8af35c6a466698a2c50d52f30d4d67b20ab9e47a SHA-256: 3de8ce47c2478f88b3b7eab2370170501533a28289c43af935bd634a201d26ea
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, likely to distribute further malware or phishing content. The document body was unreadable, but the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094c2b798603---68861887187.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/e93bdc4de9aafb538904e0370fe91b1e/nupexedon.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/78758620021.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f204f4ae2cb85d468ef1aef4370372f6/75716522828.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4ovgqfutakhqot2ggof7rib45s/gadiwafinerewuluvug.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c201374893e---lonepisafesawiwo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf8021d42---runepezodonijitivuduvu.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/39374246803.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/woxotaselafejemiwavuviz.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/pajigiwepigirinobatoj.pdfIn PDF document text
    • https://digireg.se/upload/dixebizofavijexidamow.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/toxozazenodorepobafiwoxo.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/goruz.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/teputitoja.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/vutidux.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160788f2d3d8d7---niwapegutefadipo.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/demugudedexuziloka.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/pupeda.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90ade5fa8---72683821296.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/46154e45ee2ef0225de7f92e50b58450/44914003757.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3f50cbba---13655885720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manufacture+technology+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 17724 bytes
SHA-256: 17bc83f6b8c421b3b2357bf58b5b1c23402f8fd36f468cda4bb43f674f62f599
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 10848 bytes
SHA-256: e8c92dc910929fcad987e4140912e8d0531bee407e276bc1cb83e714fceb1c9b
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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