Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7676c5be852f4b1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 02:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ec3492a47bf5ce73d5968ee0d869149 SHA-1: d2550c191a043f726faafbfed5f9f2995ac3846e SHA-256: c7676c5be852f4b140cdc2dcdb4714b70b9eb848f0e163f496d43ecd7d1d6714
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the presence of external URI heuristics further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=manual+do+proprietario+sandero+stepway+2012 PDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da20ece3a0---62878841631.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/veluwozajadawoliso.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/94260042450.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/98828532141.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd89163eb---15086731199.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/42358055900.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/newekitoxiwufesorakem.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/60110692302.pdfIn PDF document text
    • https://ayurmitra.com/files/file/mivaramofawivikolevalet.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074489580c56---xaxozatapudeforugawefuva.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/hmasrb2pir3fnu21vqdmhv2pv2/lalubonaxe.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f1nislepfa56nteuq85rbfn0q2/mojujulijob.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f1adfe40---jaxenafenuwikuwuzuvaki.pdfIn PDF document text
    • http://planbmedia.hufiles/mapanudolamizusefu.pdfIn PDF document text
    • http://baby-daycare.com/uploads//files/202108102145086736.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707fde0da4b---30993551541.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/pi4bfs1etfd01j38m8r7lqr7h9/56144247740.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50051649149.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/82625961171.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bazikexeji.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/zonatiravu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/14664588441.pdfIn PDF document text
    • http://vanhacollection.com/images/files/veneveruwawek.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/lt8d03jhgtmakjtpdkqv39jlh9/musupejepunosif.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_off0000d2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 10972 bytes
SHA-256: 2233e86af317feacf7964b0b46918beec7bc489bdbf65eb74b8c18e7385d9ca8
font_01_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 19468 bytes
SHA-256: 2c1713452b03f9eaf8342d284d7c762b4005385bb8e1945f976e0ef270e8092d
font_02_sfnt_off00011e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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