Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9395a1cbb99aa2…

MALICIOUS

PDF

90.6 KB Created: 2021-07-25 00:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3dcdf3cf535c3b79b8d5d3114606260 SHA-1: 25308d04323efd9725d6dcd84b355697121658d8 SHA-256: 7d9395a1cbb99aa2563d34178b23f7767a6ba18f20a70176ddeb108bb6a7b3db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms suggests this PDF is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://erex.hu/upload/file/36638336115.pdf In PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160affae06b1db---dikadetu.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/23q4sm5v75supo71vr41r25qce/85089728886.pdfIn PDF document text
    • http://erex.hu/upload/file/minosizujo.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/79080412717.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/4629986523.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181e000aca---niviwobejipokatojejud.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9711a955c1fc9c76077153dc85841980/jopokuxelajuwizetewuxo.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d244253c01cabfe831c222b6eb4d4cbf/tetevidogutajiw.pdfIn PDF document text
    • http://planetamama.ru/files/file/nazebasis.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7235b82a---56515250705.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/vevexugizokijere.pdfIn PDF document text
    • https://dintek.eu/uploads/file/mebivakadabikewosojodagav.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f186228c086d90bf4ec05b95cf6594b6/28194567747.pdfIn PDF document text
    • https://edarky.net/data/file/runetarepejavozugukebamaj.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/dabojin.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/49651990297.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/49862020739.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e22f80bef---numebaxuf.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/pokugosenometol.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/lobivi.pdfIn PDF document text
    • http://zimmerei-possert.at/70011924233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+beck+depression+scale+used+forPDF 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_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 11044 bytes
SHA-256: 2bb624cc10a278dfbedb37d78836f1109b5521e18ec77cfd632c0f9065c28a33
font_01_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 17284 bytes
SHA-256: 2079022ef8fb953e0eda1a7dff1f6a95f147aab81a04aa701395138da415794d
font_02_sfnt_off00014443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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