Malicious PDF — malware analysis report

Static analysis result for SHA-256 7880a4e65e207c8d…

MALICIOUS

PDF

86.0 KB Created: 2021-08-07 23:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 269bd399e80358a33dcfbafb214c5c6e SHA-1: ed603517e6f15593c51601577bf3751feea32479 SHA-256: 7880a4e65e207c8db08d749f9c62ce67cff62cff2bebdb572819870c2dc61e57
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to external sites, with some links hosted on compromised WordPress installations. The presence of 'invoice' and 'download' lures suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=maintenance+contract+template+word PDF link annotation
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/28397520237.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070148cba09c---varolatefoneza.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/fc8b16aa4ab838b8bd1bafb355c4fbfe/22301229732.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/29718587731.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4100a99150ef316bffac47b824318b75/zavegoxe.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cd7f869f5e18ded62ad74249450f60ca/97531633959.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/wukoxilesuxow.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/78620010374.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/76171185376.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/45099454174.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b0aead2f---monozimisav.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/kitekado.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbac986a3a---11884192998.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/9090687147.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cda2a51ff---pukufekek.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9e962ba3---netaxuwumalawinavunun.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/hemncfgaqd4t300gla6duq0jjd/kazipudexedipatod.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/uiqk3efqkbroi780sca9ckeb1v/45190390652.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a518d6a7608---31767691815.pdfIn PDF document text
    • http://charivne.info/images/file/34209060999.pdfIn PDF document text
    • http://healthywithhart.com/res/file/sezekoz.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/texazivuzaku.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_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 10588 bytes
SHA-256: b2d8c4d21c4c6f1af2085b9e9d21ac842c0f1e3c814b1d83e4ebea3d0f2a1ba0
font_02_sfnt_off00011c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C57 17496 bytes
SHA-256: 9a54247bf874892d725fef45a0e8c94b8d152696f7b4436f370f5e46b3456a72

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