Malicious PDF — malware analysis report

Static analysis result for SHA-256 739b9bee0d3ab43e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 09:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0744b05045abc5b9506ccbaa352e62c5 SHA-1: 37632dbcf018723446bac00c2ebf122db4cbe6eb SHA-256: 739b9bee0d3ab43e852bbe8ff50ca26dfe18ecaf79c25ec8da805a3fff0e096d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are indicative of a phishing or malware distribution scheme, likely leveraging a PDF exploit to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=the+poetic+edda+jackson+crawford+pdf PDF link annotation
    • http://homokkepek.hu/editor_up/dorilugevis.pdfIn PDF document text
    • http://unityproductions.com/upload/files/momesimatuvowuzo.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/mokiwunox.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/60971376744.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/kesav.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/pudozapadazosulikuwobiv.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/vawodajudororen.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd02db3671---sozodurudufowadasere.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/rufegona.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/joruwiwofenaweganeju.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/b1n3j9bqckfs9bbg4t5u497nul/10207006607.pdfIn PDF document text
    • http://husplaza.hu/editor_up/91606460583.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/kotomumumenanilago.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/dewivimosivugabubopuxopa.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/gedojakowiwotomalibawotod.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/jisunuj.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/59833202222.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e898b780cdd8fc55ae84ec1dbf4a28c3/sawuxikifavulasazodepez.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/77976283439.pdfIn PDF document text
    • https://henuopack.com/d/files/43058915009.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/85742121417.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210901165150.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f7ooa49s49ut55smcg9v6mfvn5/43983557329.pdfIn PDF document text
    • https://diphong.com/uploads/86395686388.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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 18484 bytes
SHA-256: bbd1a67cc2461e34350d5afd8f05e4309c17566a08fe4ea568f53e37e342488c
font_01_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 10940 bytes
SHA-256: 1da063572340cfad7f2809b6bfabd11e56e37e4ac77b4755868a6fe5d82aa21c
font_02_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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