Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a19d7372576bfc…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 22:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5f715d5768909694f500e4ca7958ace SHA-1: 2c52f0c3e42ab1211818316aab28692493068206 SHA-256: 82a19d7372576bfc116bb40eee47d286f77923f2967c282f0adfb0dc50d15c92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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://alakharia.com/public_html/userfiles/file/45876600740.pdf In PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/369c261c80f38e4361272cb30d07680a/vadejimawibarupoxa.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/96421962112.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/69335093713.pdfIn PDF document text
    • https://limmaginebistrot.com/file/75858138172.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a633ced428d---46917510261.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0b4c5049da9c583566793249838221ab/61540293490.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/jetuz.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/74404171733.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/19355411945.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/nevotuxafekojetijumejovob.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5585f8d2d8a89ba1739493077064a644/85568756121.pdfIn PDF document text
    • http://cwesp.biz/upload/file/zuvativenijilibelofimof.pdfIn PDF document text
    • http://artside.org/data/temp/file/korijuzegulafapog.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/78040190204.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/jobomapojirexitabijevif.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
    • http://lyshiying.com/d/files/nodipexepijemopevivalut.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/46164f6fc3e71d897d3a322947e7f24c/83558544824.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/7010987532.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e40d51f4646767144c6f655181e92d75/bivaxar.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/mutemekixivubuza.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/18642069094.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d50d09ce---doxamafepepev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+quotient+of+14+and+7PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 15164 bytes
SHA-256: 2a0e3a49d6fb2bb0787cf7e9c0375f8fe77b15fb23a60a2d220a39690e697803
font_01_sfnt_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 10524 bytes
SHA-256: 692f1389e022a675bef9abbe328b2b6132364adbba75769641ca40390b183022