Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8347d5d49b91ac7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 17:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0602cd8535e38556faf0b64ddefb3960 SHA-1: 931ed65903c777ee2f8e12999897dfac24239f49 SHA-256: b8347d5d49b91ac7bb8eceefe453517ed7603b612e6c74ae997a4e744e8d7e76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to download further malicious content, likely a phishing page or malware.

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://mkontakt.pl/dat/file/42039161720.pdf In PDF document text
    • http://autoscuolavalerio.it/userfiles/files/86891885948.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/34821924328.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161310387bf96b---denagunivuvolofakunazum.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/3395611632.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/sifaguwisotezemawokewojob.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/41120983384.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/jidebumaxakulujozaru.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ccbd90d7---34452125608.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vutinepesotov.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/nilixofebitodijuti.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/11623219297.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f99d8859d---fupiwiju.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/jusajifedikuxuzuzetupa.pdfIn PDF document text
    • https://designclarf.it/file/36332704754.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/pepabataxivodavez.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/m1cvovccqkrtvuv3669d42mqvf/742610733.pdfIn PDF document text
    • http://rhondachem.com/d/files/62902912426.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/47486290286.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be5aab37387ad0b974cdc74dc9daebb1/77821186489.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/sonotoxofeb.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/39615207750.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/34115700709.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8fd226b274ee9d30d8305a3fb6b27d56/29388399280.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/dezogewepomozajebol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3+player+browser+gamesPDF 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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10716 bytes
SHA-256: 2dab3063db2cb38ebd73ad4792e87520b07a89f17a37574c2aad941e6bc4aba3
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 17680 bytes
SHA-256: 853975a4dbbc35c0641a4dddc7a6e9ac3aff0b25cfb13621176ddf203089530f
font_02_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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