Malicious PDF — malware analysis report

Static analysis result for SHA-256 36252b4d21ee6066…

MALICIOUS

PDF

96.8 KB Created: 2021-09-19 01:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2cd431a5a56283a0d6b0d2f88b8979b SHA-1: 687f41d2d2ac91541074a3f566ce6a57f8052c83 SHA-256: 36252b4d21ee60663ca2e327aa3a2e0dec46d6d75a4411b5135fb3e8bf3e8b6f
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which are hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 9

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://af.ssla.ru/images/fornews/files/sububizixutoxiwax.pdf In PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/81302485716.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145ed281dea6---lujulakalime.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/kokipawimitekuvekowewed.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/senofujajexelexit.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/12853820531.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/58113156003.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9e9d114d---98375476276.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/34534421138.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/68432515446.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kavajokubirugom.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/wuboravederuvenux.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/kurofudidesivubajozu.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/51260379534.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/gatakatotekomerope.pdfIn PDF document text
    • http://capital96.com/userfiles/file/55133295180.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210918063042.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161415e6ab022a---lasusirisosuka.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/potemutegifodejop.pdfIn PDF document text
    • https://latework.cz/soubory/sepulefobosu.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/50441953002.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/zibuzemalo.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/biwumisa.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/46681040610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pinoy+movies+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83686fb2f---65067821531.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://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_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 10684 bytes
SHA-256: 081f55be582d215a094dc1f87b377cf0578813b0d8f5ee7db2bfd81816cf0f23
font_01_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8F 17460 bytes
SHA-256: 4c107e70f3b230b41932f16bb06843f8b41f8cafa038bdb8c3ac2074bfc35136

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