Malicious PDF — malware analysis report

Static analysis result for SHA-256 413748833a885ae4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 11:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 20671c40a63d1aaefdd39a12f1aef6c6 SHA-1: 27c026739d45f658229a97a346970e2a8f5ea16f SHA-256: 413748833a885ae40e120751df58a548c6c63440f8e8353aa15b1dcd2f7c9259
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The document's structure and heuristics indicate it's designed to appear as a benign image, hiding clickable links that likely lead to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=car+driving+game+download+for+pc+windows+7 PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358bd389ce---40153287486.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/xokalamebutorejibises.pdfIn PDF document text
    • https://huanghecables.com/d/files/jofaxexaligonodovolejiz.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/33566550289.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/monilipoli.pdfIn PDF document text
    • http://semanbio.com/upload/files/niwagedolakagupog.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/velakotituzejeluxaveb.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/kolowuwixumani.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/tanoragelegulen.pdfIn PDF document text
    • http://jonellchem.com/upload/files/29145307509.pdfIn PDF document text
    • http://askaudit.ru/price/gunape.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/50818641749.pdfIn PDF document text
    • http://dasbluemchen.com/8923931232.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/gikajoxibifijezugeg.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210923010931.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613977805e51c---10797423857.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/gotuxenasutotepewepajos.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461e1306521---97343476597.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/nujiwusosowadi.pdfIn PDF document text
    • https://ottopianos.nl/files/15112501434.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210924021945.pdfIn PDF document text
    • http://skene.es/userfiles/file/83242410063.pdfIn PDF document text
    • https://aneri12.eu/res/file/noxupotetexomamarigijijap.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630697380.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/55865694473.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/96232985973.pdfIn PDF document text
    • https://hoongnau.com/upload/files/soriw.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_off0000b546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB546 11100 bytes
SHA-256: 62afe97d05c34a9636cdaed26e548fe249bf33c41064bd71f39873c6b216dabe
font_01_sfnt_off0000cf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF09 14348 bytes
SHA-256: d93bae13f84570dd2656a8413cbcb83eee9c7fe024b0fd98a0687b7ae65604c8
font_02_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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