Malicious PDF — malware analysis report

Static analysis result for SHA-256 da780462b0c72ef4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 07:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68e43c2dbc3d48420dae76dc296a3171 SHA-1: 393859689cbd56e192281a75212de8e0aa8b0602 SHA-256: da780462b0c72ef4318113f27e87d57ebc857a1553f908223520ed5cbd0902c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://shanghaicruiseparty.com/uploads/file/7717656789.pdf In PDF document text
    • https://pannonfinanz.eu/editor_up/jofigu.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/gojekedeguxigozojeku.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/99993693678.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbc8f3b64---japusapopitinisajapul.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/51930976453.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0665d334a---buxujokexafo.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/gezaxukilozawog.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210923_41CB5D714B0EFF81.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139df6554bfb---59379147509.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t96i52fqde48v7khla7vod684j/12577262393.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/14118197285.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/sibinenika.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/39613137099.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/34445941570.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/nawexogala.pdfIn PDF document text
    • http://emannsltd.com/userfiles/55993132387.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4960d1b81b8136b27fd998af239770cb/70419773163.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161362b496ae77---setipavoxilexefeseda.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/xodalugid.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1307524148613c90a88d6eb.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/vupopa.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/lejuwotozebusidipefeduxil.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/95304866705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+app+cloner+appPDF 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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 18384 bytes
SHA-256: 2c0cf2c2f682823059bff874c481052c0445acf6ff8470d7917254a9fcd8c2e5
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 10328 bytes
SHA-256: 4ad74ec9870722217475b3cc7df66b1d4fcf786c60ab2023f662ec48c1dc654c

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