Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e50639491e7a2e7…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 09:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d487433ad19b6e6bf260a5ed170589d4 SHA-1: b355d9855a149fc3acf57ebfc53acd0f791ce8e1 SHA-256: 1e50639491e7a2e751ab6c9fdcb9d4930f2657f6a1c34ea24920bb8cfaef9285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on what appear to be compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it is used to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=abb+a110-30+contactor+pdf PDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3371657ea---misemafuk.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/77a1f48eae0b54bde69a2b3ccdfeab66/24414279884.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/81065204739.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/35054418687.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/mokot.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/88594082739.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/29271109798.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/bosobob.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210805102643706.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a587e665fe8---96818536195.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/44012802128.pdfIn PDF document text
    • http://placc.info/up_image/17575309721.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca236ab3d---54282621847.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/99289849916.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/83605427203.pdfIn PDF document text
    • http://mebco.ru/images/file/85308960019.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fugonobizomofirodopej.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/09658612083ef8ca2012dae3ede3cb1b/17438622488.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/zuxaxis.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f8a1b21a1---80211277215.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/vamitusabokeguripo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab0616642---69106784464.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/99316253260.pdfIn PDF document text
    • 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_off0000ba9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9E 10676 bytes
SHA-256: 135a59b3725df142ff7359d561c19e4d7805e17e383e0a8a426d4c423b5f28dd
font_01_sfnt_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 16620 bytes
SHA-256: e6e0a2061d3e1afe76f63fb9db3efe63fc38b45c8d7b0a4c2eca84f639163454
font_02_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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