Malicious PDF — malware analysis report

Static analysis result for SHA-256 40316c3b69e2dde2…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 02:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1f68998f61fa46e5dd0727e91308ee9c SHA-1: be6791058ea430b0b978b2daff948634066a774a SHA-256: 40316c3b69e2dde210e1fd8635ef7e6643644fd5e56ac32f500621f6bdeb4e05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external links, including one pointing to a compromised CMS upload, suggests a phishing or redirection attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://artetendasud.it/userfiles/files/74011054875.pdf In PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/75291660784.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210903210127.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/rikekusifexuf.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/bobixuzepemagipuvo.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/bizuwig.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/lujorotugunaf.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/13302314857.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/loxidugeravepo.pdfIn PDF document text
    • http://technocom.pl/editor/file/31061002635.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/92645811541.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/fetowevadojemirikubo.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/52919387340.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151d6b76e3f4---71023188087.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/9045315772.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/lexevu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f5903dd4---22626017148.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631161354.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/bakufinurapimek.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5d97faeda0e3e5858750f564329a2486/webogobaderebu.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/89601697459.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/majupoz.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/99939761320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=play+free+3d+porn+gamePDF 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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 15512 bytes
SHA-256: 3c2c07d25428ee34399746f9ce7433678c31f52b194c7f544c74ed553547fb95
font_02_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 10772 bytes
SHA-256: af99f31a45808fcdf08773f1293dcb1a5fec8b5043e2e06315204a5eaa04dbba