Malicious PDF — malware analysis report

Static analysis result for SHA-256 f332505b229a3fb4…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 02:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd703f30c20a015f975c2415ae32681d SHA-1: c074df6dc2b8cfc6dea810d6c5b20baa0ffdf716 SHA-256: f332505b229a3fb4cf9a866ae1098af2c707fe07937939434e8dffc860e53f35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to compromised WordPress upload directories suggests an attempt to host or distribute further malicious content. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://jcmimoveis.com/userfiles/file/dupisaganejikibodivopitam.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7893e0feb3b30e96c90990a37953afed/5085692315.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a7b1f6c5---60211129396.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/fitiragekoji.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/i3lqnc2321mdn7uv2892nsa541/65448879985.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/096e8112aa6ada79141d4cf68412d40a/26182833132.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e61530d64---femirokaxadomomawivekilor.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/dapavemijubuweboleda.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/59742142715.pdfIn PDF document text
    • https://petek.biz/resimler/files/63984667387.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/39932684624.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/ninemuxuve.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/8046788457.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-24/20210724021049551241.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/52171132010.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/21c9c0f3ec6f8e9bcd92c7f332268481/64672747327.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6eb82135d6f1ca003931abe3206925ac/divinek.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/86175018012.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c278010e90e---wujov.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/41789575458.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/matiwola.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/52v7bpfpvsed1a2982uf0de1m5/famul.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/13154217212.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210613/file/16236178969154.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/2cf74c802aa73b20c428bcc836331360/boguzewaronejimemaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=after+menopause+sexualityPDF 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_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 17372 bytes
SHA-256: 1c4a256f6fe8bbc2c07d88e633084272265526d5d90f19d0e11f6ee1608a3dc3
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 10816 bytes
SHA-256: f1d514e8b0d53568d329798d8e8cb7dad8df751ea6b7459ea0101b5ac15018e5