Malicious PDF — malware analysis report

Static analysis result for SHA-256 8550712b4ec559ac…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 10:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55fd5c36a4a907a58748822d8f23c0ae SHA-1: e0ff160956f1ff773ff7e5b5ce0a123ef59c3aae SHA-256: 8550712b4ec559ac5f55796e377c72cd138bd7979cd9bcce8ec6f2e0980b1236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, including compromised WordPress sites, suggests it is designed to redirect users to malicious or phishing content. The primary attack pattern observed is the use of a link farm to distribute malicious URLs, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://value.ae/userfiles/file/dinarewu.pdf In PDF document text
    • https://dcimx.com/files/36686214837.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/32964104174.pdfIn PDF document text
    • https://doitoutdoorz.com/file/MXz5ghTtGkrQ0kwL.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/gafopitobog.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/nazugekivakezevis.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/kafepetixerawimuvulipotit.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161300bb703f88---49711367464.pdfIn PDF document text
    • http://rc-modeller.se/images/file///fegekibixip.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/jegipudulewudixojazogif.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/simajujunotezatutikidiki.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163108851267149789316.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/43907712801.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/65605560921.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2a7190f0---36298233429.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12499308619.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/nosan.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/78256633986.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/33867777890.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/63926703728.pdfIn PDF document text
    • https://aayams.com/userfiles/file/naferazojojigorikakikevin.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f1bfa0ee64676027b65988c0a8ebb687/39273986669.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/fajaxusoxudilinigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mobogram+latest+version+2020PDF 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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 19048 bytes
SHA-256: 09abd6b1f190f1301f1a6fcc77074f3d049954f4edf2925e4ded83142c2bd6f7
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 10892 bytes
SHA-256: c481ddbf141cc12c1d417aa2093c8537325b6b7dee93b3dac75577be97c4529a

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