Malicious PDF — malware analysis report

Static analysis result for SHA-256 80861457dc14ddf7…

MALICIOUS

PDF

88.7 KB Created: 2021-07-28 04:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 952a3646a93179c7b95e10a6732cdfd5 SHA-1: cd472beb9840972114054836c0c96b8454b21143 SHA-256: 80861457dc14ddf7cea59d5276a98b635ab3f35d33f82c0e5c75548ce5a48eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. Heuristics and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/d518cabf796c587a2241e7815393ff58/gumakudixafegudegivo.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2tvj5s4k6le5bqo5o8monodmev/84390216730.pdf
    • http://reguitti-engineering.it/userfiles/files/penalusokafobinovufix.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/17415514674.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f35b340c---xepuralu.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d70898e45a3---xidufezelelovi.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d17e28290---1471683914.pdf
    • http://au-zlato.sk/upload/files/dalefesixugewi.pdf
    • http://matstravel.ru/userfiles/file/duzupofejozini.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b422e01f4d---20147127073.pdf
    • http://praguetransfer.com/files/file/numowoxobesuvow.pdf
    • https://people11people.gr/uploads/File/pixedogetimiraso.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/vobujalumuxomuri.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc0614e8ce7faf8abff28692bf60ac9a/5287893351.pdf
    • https://locoffice.ru/userfiles/file/ralijifejekijububolukokoj.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78b694393a---fivogulogigagomuxezas.pdf
    • http://tomlitkom.ru/ckfinder/userfiles/files/lavozabot.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8e692bb4---83084667640.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/37060838029.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/be32703e0445805a433dd28cc69124e0/fawonirojelifipi.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be00c41433f760ec05541d585bdc0ffc/31155382126.pdf
    • https://orrizon.ru/images/file/jizidil.pdf
    • http://lungshingcentre.com/userfiles/rikape.pdf
    • http://medicaldistri.com/ckfinder_files/files/suliwexego.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=navy+boot+camp+workout+schedule
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 16792 bytes
font_01_sfnt_off00010eed.bin
7926a4d4717974b562eb3eb31f45dd505d4db41b010f867b5578707d4d0ddd44
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 11156 bytes
font_02_sfnt_off000128ee.bin
6ae6b485125b55afc78f53ba886c5bad96b4d6f14b53085854452d5640af028c
pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 16596 bytes