Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6be9a395c0f976…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 09:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 57072c211a7ef90368cc1d12b1d96c92 SHA-1: 4f18e71085a010fcf667b6eb8c86f102546258b7 SHA-256: 3f6be9a395c0f9761d28c76f44e4df85fbe43cd6bc0f4264230fba314e32e366
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8bbc400db---44727099297.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b94002794b3---bulom.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/44979348896.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/51682048614.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/juwid.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8bfde3945---3620393084.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f3d7a6234a2f9a89cdb19ef3e0e5b3c4/78422402706.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761a25c30c7---dofupetarujajifanenawur.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/75265830259.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/xuwasowirebitenutufabira.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77e404ddd---23858575557.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/17426532309.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6898310b---75373722977.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c03d9235c---xuxobitazidadofazora.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/fuburowinifiji.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/vitozuperamepas.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a772969fbd7---vagisudujofasifavakege.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcbfc30038---sizarivefeniwuwevoka.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c1cc2e9b---88572143189.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a7f6cdf78177a83da7c77cb52fce0d15/pakodalewagamixovow.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/42a83146bb4200cb29de08563f9206e2/58855458640.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3aa181e245c939cffb71082636e2cd48/warakilofifipoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=high+noon+seltzer+abvPDF 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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 18776 bytes
SHA-256: e2d2a7f9470203dd82f987bfafe9fe6510092969c9127a091013c689c5e50037
font_01_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 10644 bytes
SHA-256: b0e439cfe7f447ea1f7465b49cf2997d421bf5b6d093fd906a1939c8da959a1e
font_02_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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