Malicious PDF — malware analysis report

Static analysis result for SHA-256 161d15bda2efa990…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 15:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 544a13cf886a9470609dd4a521826849 SHA-1: ccb582468709cf1cfc27057fdaa5a4b92d7b9890 SHA-256: 161d15bda2efa9905b9f3a5431b4adc5664aa7560b285f21746306a36cac2395
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to obscure the true destination. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://stnicholasway.com/userfiles/file/98408072429.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2c7baa06---rilisuvuvasojexefejitu.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/dugonigitovutukubuvamok.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/bubumunojor.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/30660249383.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/rivomirigez.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/45682231305.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/56484854756.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613310b16700d---molali.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/37872268372.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/84271578505.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/82079501481.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/rinojodowotuj.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144b856aed0e---tixiwixadif.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/b3guohl58cpidk6iur6p5330do/98563953040.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/kadafosaluneti.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e61f7e909---14206981353.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/29870382875.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/gedozof.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fiwukimumojopivezos.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/77693495003.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/23335456388.pdfIn PDF document text
    • https://mkontroll.hu/File/dipiz.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/94815009913.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba3468f01---95163114896.pdfIn PDF document text
    • https://finliz.lt/i/File/91016868655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=a+whole+new+world+piano+pdfPDF 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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 10396 bytes
SHA-256: d807ba0db96f6f9189ccc79c05ec22de1e435d076e14a58b1825b5b2d8f5b7dd
font_01_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 16796 bytes
SHA-256: 96f2f58890a94f1d9180791df699443e3019ec028f33983efce433cdae442987