Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e962b92d45c59ab…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 16:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f2777fd53c3e73af3d29405a39d0b15 SHA-1: bbc23f3bb14744f2d8f9b07085e8b07e3c0d4943 SHA-256: 3e962b92d45c59ab36766187b09cc566e651bba3bb555e754df4e9df6cf47694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple unknown URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d643c4ff.pdf In PDF document text
    • http://lhsclassof1971.com/clients/74120/File/78198781918.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/q1sc58adt5q4lvu1trop9n4nfv/xulawupujazoli.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/42123447463.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be64020e195---80322529621.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f1c4abf38---jexodubalotete.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/bavolakizaxazezewijokag.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/xolire.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609142000d48d---tabamosuzazenoli.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/84224109078.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/mokosidise.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/walipesiwinunaxikegena.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/rijegijusik.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/4451490194.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a17bf1947---75360737002.pdfIn PDF document text
    • http://air-con.ru/upload/files/92339913313.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c75dcd8d9a2138cf226f15b985cfd4c6/74809193488.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/892208216.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5a3695329aba5c80e8fc8ceedc65ad01/bixofasidi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b065b21491e---nesevotibuxugaxekigefove.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/61081846778.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b7fc97bb1b41dd69dbf8e9fe1921b7bc/2646082663.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/jitewikugegosurejubezujux.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/wobisijugexezufur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=terjemahan+al+quran+indonesia+pdfPDF 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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 11004 bytes
SHA-256: c62807c57f16b8dacaeeb623aede9c45eeda71ecb90f4c066b8aa7b464b220d0
font_02_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 18052 bytes
SHA-256: c6ac1ab3f7783ed9e1bba98ede98257d8ffaa3815fca490db65690cd78f72725

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