Malicious PDF — malware analysis report

Static analysis result for SHA-256 d964b4fb2ced1882…

MALICIOUS

PDF

88.7 KB Created: 2021-09-20 18:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28cdcc7e38c07d22f14b6a8cf243be04 SHA-1: 36237dec0cf1dccd085f200a65597555c14403b6 SHA-256: d964b4fb2ced1882053ff20983adab170d3b1c80a9d479765362a513ac9b9101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URI links, particularly those with 'utm_term=download' parameters, indicates a lure for downloading content. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://valergences.fr/userfiles/file/vorizafikosefomevejazajab.pdf In PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/nelosejikuritek.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/filuxobujeritagijidozezix.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/30132220280.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/pelalawitedegosunere.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/vifewolufa.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/80727719433.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2q7tgmqa41p908epr1baav7mqm/gogugepugezofuv.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/vetafibexekezibewopip.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210909_140516.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/45235707845.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/rusorenideduwixokozidupe.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/59799391721.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/sidomefilofageb.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614015c544d50---pewurubedo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139082a36200---kigejadadixivomidategoj.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/72617202022.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac8529360---gumixiripediwurujix.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/1608746307.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/73fb5deb6f7b3df30ccc800de56fbefe/zixip.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/julumebinozaforakaruv.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/xagabifiruvip.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/fixifenikiretemif.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021919179352520.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/jibefepobabutinamoxetiwem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+gta+5+mobile+apk+no+human+verificationPDF 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_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 11520 bytes
SHA-256: c5e434fd4f610cd1c981b567ef9c368c993529bc141ffc5b6d2cbb87cfefaeb7
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 18132 bytes
SHA-256: 2419870f4c6e6568de41a147836e291f453897abc1ce1976722ecce3d1f616bc
font_02_sfnt_off00013acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1