Malicious PDF — malware analysis report

Static analysis result for SHA-256 16916cf9199aa2c7…

MALICIOUS

PDF

89.0 KB Created: 2021-09-19 02:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba0d49b8c829db921c6db19f68527fb5 SHA-1: 77c5ec3526f3e4249c48316f0a2d4985bf4941d2 SHA-256: 16916cf9199aa2c784267a9680163067d1a9fc496a79cbff519720051d9a0a63
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating it's designed to host malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript and the link farm suggests an attempt to deliver a second-stage payload or redirect users to a malicious site, consistent with a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=repeatedly+seeing+444 PDF link annotation
    • http://hamdannepal.com/userfiles/file/61507270334.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133379b1a9fa---89472115922.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/vebub.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b3c72504---lenamexadinogo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ksp4o3nh0q8jjpci17n5tkkuhq/bamiwimewisujadibuferigob.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f5ccd4a2ba7fdf2a50da0458f999e6e5/wedodumamizelep.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/84124286612.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/pawegatozazeka.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/77324757291.pdfIn PDF document text
    • http://rjt1.org/upload/files/93799951976.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/93168322984.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/44142999885.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/duwunumelu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xaziso.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/99130127815.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf602973c0---26866559027.pdfIn PDF document text
    • http://benrassam.com/uploads/files/79569224037.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/kuvaxam.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/71869666345.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/tawenov.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210905040737.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/lemupan.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51309359680.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/derop.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_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 16936 bytes
SHA-256: 085c11039dd5e2a23ac9fe2dd9a9360dbca0c9982137939c3299802405cf2f09
font_02_sfnt_off00013e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 10584 bytes
SHA-256: 3d193aebb2d39dd793a67db7bdbc8b5db861b3750b6ee6db7ea576e4ba946966

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