Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7aa6e0de6ac3da…

MALICIOUS

PDF

80.3 KB Created: 2021-08-17 01:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40bf0516cddbaacb278d02bde92ddb06 SHA-1: a1355a22b6284cf925e65b4e3009f16ee91ade20 SHA-256: de7aa6e0de6ac3daa3231233298402e55184fb0ea66042071af47b31131eee2a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users to phishing sites or download further malicious content. The presence of external URIs and link farm characteristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=a+level+organic+chemistry+notes+pdf+free+download PDF link annotation
    • https://bodymason.com/user_uploads/files/65433682199.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210725104120_20831052.pdfIn PDF document text
    • https://olterus.com/contents//files/20128327105.pdfIn PDF document text
    • http://ramz-alqassim.com/Files/files/demunuwupunerodegekoloxe.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3739236fa---nifenunifuduputa.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/77418046879.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66a2f82e---55027436462.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/06c0cf29740a10f60834af2d7cf1c2d9/82355148041.pdfIn PDF document text
    • https://wsbtitan.com/images/file/63100453747.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/60841597710.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/48a6203487736303436bbce3ab5938a2/36082769904.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lo78oqg2f02lhrqe2ko410nhak/sewitigodenokawu.pdfIn PDF document text
    • https://eguiders.com/uploads/42655708853.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/vezuvumunogo.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/05/jowudujorepederoxirekinup.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/31647593994.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/25740149909.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/2206615029.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/513d697100ef5e98d3bbd875a1b0382d/nozakufixuzisujemotawutil.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/94161850667.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xowusudesokir.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/xusafasowukevop.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gomulawabejavemuba.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_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 11316 bytes
SHA-256: 724dca14956b07edebd10276e2c8a33622c264bf44c472c0e87d9bfeb9644f88
font_01_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 17260 bytes
SHA-256: c70e9ae3ffec86b428e495078cd94744e458d85a4d980b49b0e5c351eddbc3ba
font_02_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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