Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b8fa8b7e5f3b1f…

MALICIOUS

PDF

93.3 KB Created: 2021-07-07 10:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 468f47f13618e38e44f1535ddb5849d7 SHA-1: 2b753333148194f906d1d4841b4d749fc823d6ac SHA-256: c8b8fa8b7e5f3b1f372b8b2b3b8af20c880949f45c6d89e86cc1173bff8abefe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 6

  • 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.
  • 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://dzbnf.com/upload/file///98186051445.pdf In PDF document text
    • http://dolphinkorea.com/files/files/gajuxixo.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/87294322449.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/40rpl3d7e8pula0cakja17hdgd/6367983636.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b9829d40be457f34a27b3d8c5a1dcf7a/82289019281.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/64064bb6eef2bed88d53d94f9041ef23/tirolemarejoko.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01985d081f---matafimosoxejebes.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/98488811618.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2cc8880a9cf9a06731a63a394dc4034e/didekagiwadigujazenajes.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/sokaguriri.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/55d701bb58c58128e1ee79f769e9f4e6/judirirabumugasukafonixa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160782bff7b5fc---62158005580.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083733786dcb---92278896954.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/93162341957.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/bukuzurafojagaravilevuwis.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/8347120165.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6ea7da6b5---moverufazaxela.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ea85955c---wenixosu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6606d86b4a7a62ed301332ffa9721ad5/35691479324.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/pulejogoten.pdfIn PDF document text
    • http://yuha.be/_files/file/ripuzovapurivinibuwukid.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8eb3448d0c20bf78bc1a709191b05b28/71522143038.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4ad0406a---puraziwepotazud.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/xarepupegevuduneban.pdfIn PDF document text
    • https://combrooncom.com/contents//files/59587598251.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/divikaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=romantic+doctor+tagalog+version+full+episodePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 3200 bytes
SHA-256: f53e78c72eec337abd7ad3e36353f6561a96759ac23b92aeca929e8e89311e9a
font_02_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 11176 bytes
SHA-256: 733975bfecd49f07f4fad48c5ef9cd2a8857cce1801f0d6639ad1bdac352cb90
font_03_sfnt_off000135de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DE 18620 bytes
SHA-256: fdd67ca66447ede24b94cd0a0a9d6020f39207ac4783333a50896578f283fe98

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