Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6174efa569f668…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 11:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cae1164cce699d2c053ddb308b002d1d SHA-1: 76de726b22a3cdb3697981aab6a27376984784c1 SHA-256: 2e6174efa569f6686e9a3853703a94638024b9e168845c056d27e65d64f962e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics indicate the PDF acts as a link farm, directing users to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the structure suggest an attempt to distribute malware or conduct phishing by redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pcstaiwan.com/ckfinder/userfiles/files/danaxawijufedavabezuzegek.pdf In PDF document text
    • http://qiuyutv.com/userfiles/files/20210603093558.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281211357114.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/wefasedegoxafu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/71a52632b9e59396250e901454d3616f/52301895518.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///toxopajoxasesefezigowupi.pdfIn PDF document text
    • https://isosklo.cz/uploads/fadimumokawofinarevumufu.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/21559888849.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cef1c966f---lamewiveduzukesezu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d90dd431bbd7e2b1c9ea8542b3bdaf4a/tavadopasatugovonuvudofiz.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/giwuxolavefipuxudemajokab.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rssvb8ean4hmjqnb64e6odte9p/2016244879.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/79341491640.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8c6dac2c08gug1d9uma5iem0d0/lizevazasutiv.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055dcfb6447---xilijelatedogex.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/462b9159a8364a368806a789b26b5597/wozagirol.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/jovopi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/7eobeo7p9dd66n82g11tr2vung/kelenalinuvuvadatiredame.pdfIn PDF document text
    • https://corghialberti.it/file/migosokakubusonofados.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/96575034066.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/34427856822.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/jebonawabuxisujujubapuk.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/67119675.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3eq6su1cvq1khegt9bkduvcea0/46199036025.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4h77jrg7a7neo6lqucjk67u319/18550127907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=skimming+and+scanning+exercises+onlinePDF 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_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 18196 bytes
SHA-256: cd0c63fe2423bbe188a1becea1905223f18e37776153e3d98bcd6b0603a91dd9
font_01_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 10884 bytes
SHA-256: 42d5db6949605feca7f40205c26d7d6a323b7fa78f68b422c6f50e26d39ec93d
font_02_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1