Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e665c9fa9025c5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-25 09:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4254dd76877ca2c6326881bbfd73d13 SHA-1: 25e1fa096a0aef18a85630666ddcf2d16723dd0c SHA-256: b5e665c9fa9025c5c601c802bcafe2d7d9d3f7cd3b1e4c1de6cfa8a08732d518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hitmet.slektenkaas.com/bilder/file/41962422371.pdf In PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/86909126672.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/redaxuvedeliximamemodexid.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/tojutiwaxulomu.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/temagawajiwisiruwozanobe.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/nukedazutus.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/10465265969.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/299ac13babe001187ea6ab3e0b9427a2/49105662758.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/xarutuvit.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/89451330098.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/83190880486.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/11887831233.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/rutezuja.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c7254d2e6508d534607b2a2224e446c2/gerifu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082cd78d76---36801122826.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/20083808603.pdfIn PDF document text
    • https://faceless.me/userfiles/files/43128072471.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/21982924642.pdfIn PDF document text
    • https://jin-ji.com/upload/files/movemipulowadiwufe.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/12651070009.pdfIn PDF document text
    • http://zenpersonnel.com/UserFiles/file/73992277348.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/h57m4e9csjcusts8nohb58d1n5/37094255242.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/82788447553.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/41772763361.pdfIn PDF document text
    • http://rayer.cn/d/files/lonetuwili.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/96070526295.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/wawadurerafokifel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+brightest+star+in+the+sky+ep+1+eng+subPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EC 10828 bytes
SHA-256: da5ef105a787603c4e8fc9081d4b1143cd06b0d34582b9ec48be3601ea0b1b32
font_01_sfnt_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 18060 bytes
SHA-256: b95fd57ccd7a2e0d4cfb5f9937fcd9b0e730a148cf0a521d62630860f0e6e0b6
font_02_sfnt_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 14972 bytes
SHA-256: be7b4a4e6ae6f5ceb474c3019cbe3d4978678f421c0f2b00b1d7844740123dcc
font_03_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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