Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c4781418a5fd9f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-29 10:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ed9e484d86a8365127cfce8eac451003 SHA-1: 6006441379abd3de99a59f39b65e9fd4d2e16ba6 SHA-256: a9c4781418a5fd9fb6f37bac3dee438df71097a724976c504e7e4ce3a3ac45a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://allytemp.ru/uplcv?utm_term=how+to+take+talkback+off PDF link annotation
    • http://ahdongjiu.com/upload_fck/file/2021-9-5/20210905011317581542.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zaledalukepa.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148051d40d89---35986715749.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/62339473315.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/guzovapeduvagumovujubes.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/dapunamaxononugagalenan.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9471d73f---vemojoradaluzikarijawox.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ebcc86ad0---kufedaxovut.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/99193767293.pdfIn PDF document text
    • http://medi-sen.com/files/files/bipuwekinesukojimasopi.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/36658073491.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/vatudejuw.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/dejiguvibiwivokepa.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/46d059da9c9c66f5183bec09db546f86/38483677129.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/vumaxuvasetokizu.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/temagane.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/649354345613e6f19c504e.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/6965205308.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/linew.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tonofenikijaw.pdfIn PDF document text
    • http://pasaru.com/upload/files/7445715303.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/40515834505.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/11163577522.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/28621400573.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/juzopetof.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vonelitowiwoje.pdfIn PDF document text
    • 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_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 10172 bytes
SHA-256: 7e3ae087693a285a9a9e785f6b6c71d06c905097e56d32523c6e82457e8f4a83
font_02_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 18932 bytes
SHA-256: f7c6bbc646196510bbe3423ca1c10f0ca74141282cf6c348dc5c17d2db10fc39

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