Malicious PDF — malware analysis report

Static analysis result for SHA-256 426863b070a36616…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 20:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ccaab73d04b2dd3657ada218f8ce4dd6 SHA-1: 54ccc609001c382f486987bd11b29611e4143441 SHA-256: 426863b070a366168bcdb020786866c38686d688029f00549024c7eaf7f946a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload storage. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://urbanconstructions.org/images/uploadedimages/file/33769513035.pdf In PDF document text
    • http://fizjoactiv.eu/Upload/file/37524247341.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/8147368616.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/vosuzexatobasit.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/43358474550.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2bd21cecc---bunoxabebutixufowoge.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/90637118825.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109151019464586.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71466682357.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/21061262359.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/niwexezigufafutiwagex.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/miwezasulavirifilujoti.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/kofomibukokus.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/lageb.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/futoje.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/bufusegoxetofegikerum.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/jamabute.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210908121333_zz8dcm.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/96783255543.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8065l5dvle7etg90pgjnsab037/95031221359.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aea73be62---5840792117.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/75921125020.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/powov.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/70825921611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=update+not+working+in+play+storePDF 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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 18072 bytes
SHA-256: 7e4d34bf047d7faecc806bec1c94c6443b8e93024985653c9de2186dd03ae794
font_01_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 10868 bytes
SHA-256: b006c1c93628f1676fbce3dc9985672a1cde4e70c4c8c6453332e875f3131cfd

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