Malicious PDF — malware analysis report

Static analysis result for SHA-256 91df04b0956b5090…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 08:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e93bf0d828cee8a4c2141f44f6f8a44 SHA-1: 0ff9f1ebc972c51779e44897cc1f0c01b9bacde2 SHA-256: 91df04b0956b50901b75945985caa61d481ccf2aa4028aecc828d198c9270d9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious destinations. The presence of 'utm_term' parameters suggests a phishing or SEO poisoning campaign. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=codm+apk+pc PDF link annotation
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161431e03857c4---tidojefibaxubebipuxifu.pdfIn PDF document text
    • http://iphysiology.ru/upload/33461320849.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/1322005302.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kkjmovp95r0kstorlq2ltqbd33/89302135621.pdfIn PDF document text
    • https://pecsikult.hu/files/file/tosugeluwexode.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/wukuwukofusenaj.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/deziko.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/456414794.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/7252262587.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/xubipilevujifimaref.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/41032515170.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210919065439.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d4ab6c22a29d79b0eccf7ab20620eda2/sorisexogajewikurowotova.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109071300127353.pdfIn PDF document text
    • http://clingac.es/d/files/40681665549.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/pudizilonipuvogeg.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/n5blnji9s9pmhk0hebfvf86sr3/13444947266.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/sodabekef.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/26970380056.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210913_F0B002680A84F811.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f637cd5262---gizupenobetepivu.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/ravefiruwuzaderapereri.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/nogiw.pdfIn PDF document text
    • http://dakov.hu/_user/file/zejenowusatamagabosuvuxap.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/24936831078.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/jinodaka.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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 10060 bytes
SHA-256: 88ffb032546e10558478df2d751f467092c98bd329136c65ffe1569efdb61059
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 18120 bytes
SHA-256: 611f50ae50a19b9138ff66cd04e5cfa8ec524158e78f6dac0e32a54a11d57d18

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