Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbba7859ed428cd2…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 23:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d2f77b8b53419cac299001041376992 SHA-1: 11b90b67b0b148e88eb7750d769c70165272a03c SHA-256: bbba7859ed428cd255e19e11628799f84aa8ad2e2213893ce398635ac00ea22d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs and is identified as a link farm, suggesting it's used to redirect users to potentially harmful sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports its role in distributing malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://allytemp.ru/uplcv?utm_term=how+to+put+apostrophe+after+z PDF link annotation
    • http://www.guus.edu.mn/ckfinder/userfiles/files/88703929221.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/suguke.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/83732530429.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/48556684532.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2fee47a7d---94982501046.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/54278332417.pdfIn PDF document text
    • https://braus.uz/images/shared/file/85058007724.pdfIn PDF document text
    • http://abpaluso.com/upload/file/13474434736.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/moropidivedogijitizikig.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/foxefum.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/naxudexadoj.pdfIn PDF document text
    • http://weldingplaza.com/files/file/nilekunodarivowu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff43e038b---govit.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e6f66d5fd---31466768151.pdfIn PDF document text
    • https://aneri12.eu/res/file/zawowi.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/81805043874.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/29044682222.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155f865ad46c---tuwiruxubomir.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/gelekegitu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/41965608790.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615614bc57b28---57215111488.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614178b8a3768---94391297605.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/74623821691.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/51323720822.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/44038353999.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/25780610141.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_off0000b183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 10448 bytes
SHA-256: ecf57cf7f750f9826027f2db2d5c6455b9980d3bd9e7a567c4b985d42e4e0465
font_02_sfnt_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 15688 bytes
SHA-256: 27af65e1ea30683f53b48ec9eb6be6b7a4d000feb4bcba13e07eda6475baa7f6

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