Malicious PDF — malware analysis report

Static analysis result for SHA-256 748276e2666364a2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 04:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e80ddc92ac07456bbea4d73be2cf80b SHA-1: 12b69a2e4a898fea6db8052130714664472178bf SHA-256: 748276e2666364a2f2b02e6374175b2a61df19138f599c5f59d9d7fc2be8abca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the heuristics and the presence of embedded URLs indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

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://joyearland.com/ckfinder/userfiles/files/tuwowutibitajeladerikatip.pdf In PDF document text
    • http://alrabbanoilandgas.com/file/files/zunesabuzuwufobedared.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeab6e2cfb---14515403999.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/19773864350.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a3c22eb515ad6b62cd7e56c3d9768d67/65822479610.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/36414466320.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92e40c5f9---puzila.pdfIn PDF document text
    • http://dhf-china.com/d/files/remigesewazibasipuxeli.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8eqlichvgcabtbgldh7l7fn4rq/xutomipezabu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/aef2fbb70afd512277fc30fc28a3c588/85675796828.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/82793734574.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/10159389357.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210609162326251177.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/sukuwijewudive.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/vetaziletane.pdfIn PDF document text
    • https://cartolmania.it/file/lezeg.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/22585411872.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/tujizukegovuwigewe.pdfIn PDF document text
    • http://prestopc.it/upload/file/23127901352.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/98658167803.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/240e43eddd691263c80f4816bf733bf9/likizipuf.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/81236108683.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609818c6cc30c---zipekesove.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/podomup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=satisfy+synonyms+englishPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/medemasaf.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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 17972 bytes
SHA-256: 29d7cba43e45e4d6d75a1a377d1c17858481f5f4f8c7134fecc8432afa9ce34d
font_01_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 10752 bytes
SHA-256: 6e7c79907ee7242fdae9ec5e9ad814ccbb480ce34e686a6ec4fc11906dffd9e1

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