Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d96713116cd9198…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 02:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6dc7c72e95df2ac85d23b7aa698aaff6 SHA-1: 99bd7be3d84d0d8e470775ab5ab7619930acbb24 SHA-256: 1d96713116cd91989084672b8fa40cec451532eb396146967b1955f7c79bc213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=native+american+feather+tattoo+meaning PDF link annotation
    • https://bakotech.at/uploads/ckeditor/files/95844989339.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27592d02c2---gitibivaloxowose.pdfIn PDF document text
    • https://kildevangen.dk/files/gofavulokiwodekaduxuvad.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c6b118f7f3650181b8dcf1fbc4eaa01c/rejaju.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e4686fab1---16126119985.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/250aac9dac1fb3612b1fa81986143e3f/mebesutitubeme.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/c6d2mlacvg7rggotk9u7qtnhgm/93299355828.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/kinelara.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/47083251165.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/69906856433.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/kukonejitezibojatagax.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/12735303149.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/vifikes.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/80016106544.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/84260429516.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/pizoxanugukomuxatokexigul.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8adb02236---gexuxeges.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/45c8ba881a664578264477eb77b70806/kipemanubodage.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kj3ruq3ofbfr2748dift850iuh/tolanurupunixegida.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01acabff87---5015499905.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9bbfe107bfff184007e93514b73be617/10103926955.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718fa1047df---82959133163.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/xejaxasoxasabe.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/nupafaxufofaxeseke.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9e17229d56616807625c190333deda5f/vujigi.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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 16884 bytes
SHA-256: d68719dc406b2f05ab4e1eb1396be909e659cd409c1903e83fd388d3c3203f4b
font_02_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 10612 bytes
SHA-256: 7e1140c88f74d7bd0821550891b31055a953af90d93e7354e97eb319e0c561dc