Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80a5f000cf0c08b…

MALICIOUS

PDF

86.3 KB Created: 2021-08-31 18:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 557a2811dfff0c29a1cca8dd52b863a8 SHA-1: 2129123267019518bd3d24c94f02c6cdc6540fbf SHA-256: c80a5f000cf0c08b2110ce4ad46b8e914d0d62648780edfcdd33d18401722f68
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the document's structure and embedded URLs point towards a common tactic of using compromised websites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chcial.ru/uplcv?utm_term=how+to+make+a+mega+wither+in+minecraft PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8943248213---34460218007.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/demitogaretomun.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/43205191406.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/gupifipepilikepam.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160839525f0b78---runiwetozazemodol.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/hdpi2at92kbfiul6ti0f2t6dqq/42291043308.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160705200872dc---74061503864.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/68683467252.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b1d1f87b8ac1e6139ace58d8ff6233ce/xopitezuxufaxutopoga.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a3a04bf74---44072889564.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/rusoniruwewematamuw.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/zixetenu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c3791a55---96376767178.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zasojadijoduxavolivura.pdfIn PDF document text
    • http://riceart.ir/basefile/files/53857458915.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/nusarizupijav.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/punowisuvabe.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/90005789331.pdfIn PDF document text
    • http://biomehl.com/images/content/files/muduzulolovimano.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210611094913_zbfdyi.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/78916789852.pdfIn PDF document text
    • http://topas.lt/userfiles/file/sulejisuxe.pdfIn PDF document text
    • https://avenue102.com/uploads/file/pazoxofofunora.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 21784 bytes
SHA-256: a9a37361ddde977d9f3def3e79df22e272d1fe7a9168f3b9d33bab16a0b65b69
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 10736 bytes
SHA-256: d5cd10772da5736ac849f52e1797abbae60f1022d9023d88f16ec7ff6500bfa4
font_03_sfnt_off000133fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FB 16376 bytes
SHA-256: 7050efc84fca6cbffa0812d172c029511c1fb851ce7adfadaf151488745678aa

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