Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8f7bbd82844411…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 17:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a804703eda5b09afcdd3d7924a4707de SHA-1: e27787c77977a6b4075068edeb4ec71cdd8c266f SHA-256: 8e8f7bbd82844411654870685a4586da8e78ea535febc330708c70327c7b5665
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a malicious intent to leverage external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://protok.pro/upload/files/34249656636.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vj92ocmkdm0a66afpajin0g2k5/17518979159.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/masovazito.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/16637668667.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/b5c323401c721e031780664010a8bfa7/56976262023.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fsenb6u8kiod1b1voin0agbv89/sexabiwageta.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/68621bfd05cf34eab29c4d54c598ea89/48586962770.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/38945536715.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/fa08dpucjic6dcsndv6dg8mqd6/5934327236.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/30798115841.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/ketijusivoboguluvanuwo.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/sezowakunakedepeveduxux.pdfIn PDF document text
    • http://chikatere.com/Upload/files/25662460579.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/51447312341.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/15449510023.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/47883363958.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/69632267944.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfc074e2a---81311615478.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/ginopow.pdfIn PDF document text
    • http://topas.lt/userfiles/file/40698290462.pdfIn PDF document text
    • http://scriptonica.ru/files/files/27871792706.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021060203154717269.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d568265bd4---tepibimifojoro.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/63187774155.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f494d5255---domixitavopofewopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=brussel+sprout+entreePDF 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_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 10144 bytes
SHA-256: 0355901759fc8faf527645ab6bb6c51c90eab831033e9db8e9c442fe5f6f22ec
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 18724 bytes
SHA-256: 70bbf15b97b7b9a32c7c72463459c8d2a90462d3c8463fb50ca8be321a8d32ba

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