Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba99f19392d387dc…

MALICIOUS

PDF

95.7 KB Created: 2021-08-10 20:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 89bebab70d5b333d71bee1af2fe28398 SHA-1: 1db41d29e4a0bc3c895a81ebc4f75226cc0b3904 SHA-256: ba99f19392d387dcb22e62da2f8c5a17ffc14d8a517de95ff3ec72b3610cc2d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=how+much+is+kfc+menu PDF link annotation
    • http://geometramaurotozzi.it/userfiles/files/26240320393.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/41000213621.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/xotevapigigov.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/63c07b4e81b3db07b32057435777101a/runariz.pdfIn PDF document text
    • http://maidichike.com/upload/files/52812991129.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a89997b204b---18743353588.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/38756940945.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d3b072cab---1572235422.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec87c6039---31623494259.pdfIn PDF document text
    • http://etre-belle.su/images/file/14113892385.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/aqo4cukhpq6qfur3v7meo62e52/bejotajimuw.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4f8ccddff5d4ca8d54d8a8021dc535bb/59602702379.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa4ab5381---6001090753.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/48cc8799e0be82f3a7569ad8cc595eb8/20830590031.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/99060823283.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/liratese.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/zenuxixi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbd0870568---58840835937.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/10317710377.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/povoretax.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ae3a4ac2ed2d2b7305d2091a48308e67/98841952596.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/rifugikof.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c710fb3ad1a0f349efd844c67001c0bd/matonugumobazuliwi.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/xadiruf.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_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 17740 bytes
SHA-256: 87f34c9544e808fa376c0e8d794ad789f8fe2e5b9cef786fa888dd3db0daa6e8
font_01_sfnt_off0001408e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A5 10464 bytes
SHA-256: bd014a1a56fc6875419fdfda3576466fe7c2fb6f188248df292a4ae7b7556ce9

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