Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f889f1120596263…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 02:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 34f81f5b70b67bd31abbaa4723306bf3 SHA-1: cd0b70b656ba4e6a3c25282d2163eba60a3baf53 SHA-256: 7f889f1120596263033af24d93303374246cd3e11a7657d817866f86c85b41f5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fairway.cc/images/blog//file/68857247424.pdf In PDF document text
    • https://alihuata.com/userfiles/file/fenomarukidovozutifaxux.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1eeae19984374606262f418fcc4e009e/61736056747.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/zadorerowanujas.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/lededaxi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085103cd0702---zawoseguxagilax.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/43894702402.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/rosob.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c2705cbbfb79cecc9cd3941429bf5757/gowosedojuwox.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1197a51a77---sepivunaxazozolevofirafa.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/sirarubikatuvuzufavozoj.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/54213081106.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/72698858426.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/senavuxowufafoleze.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/7832bafe0c28a8f34bc66f17bbbd8760/revibisutanetiwexu.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wiwuto.pdfIn PDF document text
    • https://themalc.org/files/file/jezuxulavusuv.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3999af9b8b32a4068aa09daa2a29326c/neripojanuk.pdfIn PDF document text
    • http://renovator.cz/files/file/nosujusosogunixudi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6ki6egpj3eebqb3p7vh7nfie25/sawabajoxakorobiz.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jixafarezi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096a4624db1d---punopirujewe.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16117bf32de57c---jesisunaxuroxopivelimuf.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/51731073470.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca80bd364---99779220287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=new+headway+academic+skills+level+1+teacher+guide+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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 15948 bytes
SHA-256: da1973e72bcdeeb2f14dbf36ee2e7cd907a48fb4bdd9f037cf4d09306243c755
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 11328 bytes
SHA-256: ced1ae0cb7118a75f15e5c57d3aaf0e6082d0b485062981e0b213f8995b6364a
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1