Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d423f3602ef11b7…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 04:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 32984f5dc65ea48fad052ad4a2aa738d SHA-1: 822bf9db6e4ec38fb89762c31315febb7234a5b5 SHA-256: 9d423f3602ef11b7e7fc2298e80afe8b02a824c46bce64a1d576acd297ae5796
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://dzido.pl/userfiles/file/69203372513.pdf In PDF document text
    • http://giorgimpianti.com/userfiles/file/jilosidoxopesipomu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/907c465a990a4e3a8dc66d01e42868df/32289891092.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/lawojawafovekafisitatoj.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/vaxufakajinove.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/bemavenoranakanuj.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/paxaxanunedir.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/10206162328.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/42419805496.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/pujabovifusowozuxatufudi.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/9679419609.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/7912626180.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/10600099295.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-19/20210919104358136497.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/5cc4b62bfdf7f01ed6935d5697cf44ef/vukilezak.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/66215527016.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/rafevenelaji.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/vikijusemawenuborix.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/90503678396.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/77923515540.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/15008715330.pdfIn PDF document text
    • https://hotelcorona.ro/files/31673415968.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210904080044_1436434961.pdfIn PDF document text
    • http://indemo.pl/Image/files/tavodi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93856076660.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/26134748393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=big+bird+racing+unblockedPDF 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_off0000aff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 14920 bytes
SHA-256: 21eed9885cfd646636d5063c189edbb094c45361dd0706aea7eefb859b15d26b
font_01_sfnt_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 10664 bytes
SHA-256: 2631abf726e3a866b353ceed26729c7f9deacead08cf7ecce7f4dfa6f52c2d8b