Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28460f3ba53d0d3…

MALICIOUS

PDF

95.5 KB Created: 2021-09-01 02:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e5d7942946c6bfb4a082d1fcd765706 SHA-1: e931932f4f76062f1c9d6a76e3c2fdbece75cb96 SHA-256: d28460f3ba53d0d369384b81a8bf0adfe6320075793fbefa1469c3c3cb2aaed1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/727da0c4bd1b0604583de3ce5a8f43ff/rakutesudo.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/681bad6bc095c4ff31f22cdf6df2fa5e/30508221168.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c9cbf7935acb1b88b3a8f19fa5337dbf/toduwumanozi.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/53342007557.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-14/images/files/85537276364.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/49260982466.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/gufufa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e1360e4d29b---gaworerevorirarojagapi.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/71150249807.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/sbt0lk1p1pg4uui4h1coe3gr5g/56122932712.pdfIn PDF document text
    • http://babamoleskine.com/files/file/6065363800.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///38165668756.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a55af2d8a5c---sokefawo.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/83794275253.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/50bc2f0a22c2b55c30ad1005ff73f528/19295227667.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/bdf9835473bc555b911e81895e4f6def/fedanipubenilanosot.pdfIn PDF document text
    • https://phr4u.com/files/visimukipixisakajij.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bea6f401fe5b6bb0f2852e917d7ac286/funodalexobewowukifugosa.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/48823912090.pdfIn PDF document text
    • http://stromzeleny.cz/file/2273462252.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/melesinumibaforenarugadim.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/kavolol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=metroid+hunters+first+huntPDF 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_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 18124 bytes
SHA-256: 29ddfa4645c7acfdb2448e3ff56c580a7f8e47ccc95099fa43e0287ef03285e8
font_01_sfnt_off000140a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BF 10336 bytes
SHA-256: 67d45982c019977c84d27df4e61486afcc7e3f7ca9227f228c18e963cfb1e1fb

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