Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0a3037f0ba7495…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 11:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ef17e21cb302bc37f1f90083d966fac SHA-1: 21610859908d50480f5a34aaa00300232dc789f0 SHA-256: 4f0a3037f0ba74958abc69f638b5690f8dbe6859f2b1f02cd8162f979475cf80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with multiple URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded URLs and the 'SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pokemom2.com/uploads/files/15279505299.pdf In PDF document text
    • http://rideabikenews.com/user_img/files/zefejukilen.pdfIn PDF document text
    • http://d-innovation.com/upload/files/52613074862.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/90998659338.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a38ee87c---logemepiramukomuxek.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/31134424149.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/milemedorenorolifig.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/93127726041.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/pojawebegutozupasofaz.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303c9f7b992---59700966767.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/razaxinivefodemazetuju.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/guxukofowabifemenejobofeg.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/tosarasakazanisanonope.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/sawojigoj.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/18084669037.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae406ddcdc---lijexitodimivolawokomiso.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/zofopifewugalegugavezi.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/tujuxofatutamikumafimexe.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/midevekulesutawunedexew.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/29465543834.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912175416720463.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/99887640144.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/gagejatusidikogu.pdfIn PDF document text
    • http://friulanapanini.com/images/file/bonalojudopizu.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/jesomofeboz.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/29226807596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=instagram+stalker+online+freePDF 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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10600 bytes
SHA-256: 40750ca30685f2e96a7049d9b84c58b8d0706ad15b78e57c0ccfad8ee08f3b2c
font_01_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 18624 bytes
SHA-256: aef00a2fc2c495142dafc8cd704c689bbb3e2e8a2d3c13d349740f2537bdc85c
font_02_sfnt_off00013adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1