Malicious PDF — malware analysis report

Static analysis result for SHA-256 d520f2eb4d0bbc46…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 22:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59dc5544160716493104c2bcb85e259c SHA-1: 8c4d51f675c345a19c0aa4e62286bbc251332db1 SHA-256: d520f2eb4d0bbc462d0e7b4c95b4b38a32d53896a40f2f812621a4cef9a8f4d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of numerous links, including one with a 'utm_term' parameter suggesting SEO manipulation, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=search+sold+house+prices PDF link annotation
    • http://scbczy.cn/up_files/file/20210717_050056.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/zolipebox.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/naoq8i8glgjr67ktseldgiroi5/jararagoz.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/puronefuxulagaxox.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/91nou5u4rf9473qd1qfpbirn5h/80978800623.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/buferifabikiwetivo.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/pafetosodaxoravedegiwepib.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/53320966355.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/62592897849.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/99763762897.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/21197749426.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/25649735086.pdfIn PDF document text
    • https://hgb.se/filer/file/luxuraso.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/71617972540.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///85082471989.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/85011593789.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/93446297531.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609893f466a6e---99398227843.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/bidutezetunaxogugavoser.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608950a5186d1---67432013172.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/76816150819.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63f3897c9---58134601137.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/42075615915.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/31578415269.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_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 10584 bytes
SHA-256: 65040d8c1b040a1b8805954be8d376aa755f9fea2fbdc15ebf9e0d529d19a9e0
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 17168 bytes
SHA-256: 8e111ee8375e7ad46843bbb90d277a12bd95c4605aaccba1ec6f3b0a49fe1638
font_02_sfnt_off00012636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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