Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7967b69b5d938fa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 18:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42d54d94b51834962e6da62e1e2b10ed SHA-1: d92b60089721df761f608f58935cf3f069afd9db SHA-256: b7967b69b5d938fa871a1d9ad5868b9a94d90b1f0d64221efdf41f19d6551d3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

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 http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbaf89ddc---65836205259.pdf In PDF document text
    • http://lnyuanzong.com/uploads/files/20210914185225.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/mopuludutuwo.pdfIn PDF document text
    • http://sjanzee.nl/file/fiveniwexu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/15617221904.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/68097058868.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/14751161274.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/26581682145.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/45594873221.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/matewoxolujusifekovijili.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/44405498232.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/tabizekakofuwegoxo.pdfIn PDF document text
    • http://novichiha.ru/pic/file/lirimibefixorovepe.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac976f457---gitifoture.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/15698902799.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/55192077666.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/kamuvixasanoforudesosu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c0e3daa4ad2778b0cc059d454e73ab61/genuf.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd6fa99b0---86602207099.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/pomutukifadu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/73937643099.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/vusudapagiruzemokofudoxoj.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d180185f0a---wadudakomuwigowuzogux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=car+mechanic+simulator+2018+download+for+androidPDF 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_off0000b5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E7 19004 bytes
SHA-256: 647727ae09c7fe5247d927a5fa3ae8262c5576dc66fab3e39022c5632384ccac
font_01_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 11460 bytes
SHA-256: f9854174e8fd19455d3805c0cae1ebe57dbb885386d172538b0dcfb992988194

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