Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e745704c8d91ec5…

MALICIOUS

PDF

102.7 KB Created: 2021-09-02 11:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f6f13518698e5d96b78cb0b5e4ef5db SHA-1: c82f50e3f57fe8e986d19d1777adf8d890f2e268 SHA-256: 2e745704c8d91ec5551790a2982d6569cd3e97f944871088b718b43d46c8fc4e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm is designed to lure users into clicking potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://akgikorea.com/file_upload/fck_upfile/file/21833808616.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca67a798c2---nodeteno.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2ab0e350---37654986157.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/9966412757.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/v0vvu66penba1bjpbit64puaa6/78536081513.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/54018119567.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/warozamakoxituxutu.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/vuzudijutulopi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/f1p83djjv07m603n8tapvvojrh/zetiwidoxuno.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109020706163719.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55ddcf2fa---96760355072.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/daliw.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/19746638763.pdfIn PDF document text
    • http://c-amc.com/upload/files/nosuninubazegidazipo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33bf707906---66072936176.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8e8cd95eaaa382e3119c3ff041ccdd9e/zituzagumulok.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/31b5f5b0afd0f98a917035e25f05b8cc/54725543290.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/37207828862.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/vejunozoleka.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/73780265883.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/55549154247.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81010211607.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7a157b9a8e440cd8a65a25ea8acc23e5/64534559066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=vishnu+sahasranamam+kannada+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_off00012956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14168 20100 bytes
SHA-256: b994f0f5df0d1732b058d2c8bc5207489d3d7230c20dd99f0f90b031b12e6b7d
font_02_sfnt_off0001748c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1748C 10528 bytes
SHA-256: 3cee08de527ba57c0ee94256122d5ebea89b5f3c9efb30d6d23add1e75471e55