Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ab32b572151e91…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 11:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 961af068915959aabe34afe3202cb50e SHA-1: ba9822f8f58e5059ae290f52c637194dd05d4a2b SHA-256: a7ab32b572151e91ebdfc933ab0777bf1e0df7b438af18b69a1c3b7168f6cc42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://myepres.com/HotelEstimator/userfiles/file/pemavonetexunibebise.pdf In PDF document text
    • http://dmkert.hu/files/file/53586610031.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/bozivuzijiru.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/kuvabinosibulevidimu.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/jixekelanuzelisaki.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109010919388394.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/movejegaboloxomiz.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/57659444706.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109071728237153.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130cfb354507---21259456246.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/tedifuvav.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/kozugerugategenifima.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/68336cd02f490b998f72ccee0f8ffc76/47768841319.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/30827960979.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/vereliboriboz.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/keborenejeleganif.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366be0ab9cb---77696553706.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/vilid.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/wepipo.pdfIn PDF document text
    • https://keongracun.org/contents/files/wurekej.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/76628506807.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gujedivopubutisuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bible+birthday+message+for+daughterPDF 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_off0000d042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD042 16480 bytes
SHA-256: 07770203f5f1131cfb6e7c5c6f7bbec903b30c78448b60fb2293bd499b738875
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 11104 bytes
SHA-256: c351c89c2a4a6ff835cbd155a04e25df7ef507cbdd3eba70d31f5a347f52fafa