Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d45625332210e0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 23:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f72fb2a13ef4391b6fec5cd780ec0a1f SHA-1: 8c7a72ec22468b3f6bafe27b8056ff4eb7e9c7db SHA-256: a7d45625332210e09c90fafe3b3b43e4f07007bee88b714bf7caf6cb0fff81b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=iphone+giveaway+without+human+verification PDF link annotation
    • http://prestizhstroycompany.ru/SITE/files/editor/file/10453533168.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/zonepodatotosemu.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/20421351313.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/47742976066.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/xibisokem.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/23a78bc14471f0fe011347157ae652d9/xixobotajogaxamepalun.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/bigegux.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/jetes.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/8238708717.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/79929978881.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/muzep.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/23246533162.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/53822642083.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/1315415892.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c686a7b5b---zozidokopokinuwasunanum.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/firenexagebapewez.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/fasupefinomuxa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bb431cf66---72452171890.pdfIn PDF document text
    • http://vanhacollection.com/images/files/41270241945.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/75775241342.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/vetebekezarikejij.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/85324438534.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/98764569918.pdfIn PDF document text
    • http://greenglobepms.com/uploads/kenosukowigininid.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/jaxupabasunupelad.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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 19368 bytes
SHA-256: 53585ca349eaf4e1a1e679017a3fc58a404c2e0a3c4d8ac83e229e06c402cd31
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 11032 bytes
SHA-256: f0c57e9c72f8ae3df236d6c1291038753b8675ccfb1a18d175eb1edc2ecb0afd
font_02_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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