Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6856b9669921e25…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45dc1bfdb5023f0b78d0b2ae48044f58 SHA-1: b1a7ab0f7d2ced2701050723f66efd3b626b4d5b SHA-256: e6856b9669921e256c51037ef48fc04dac7b92e400f8fc98d718bb19d015fe9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d8739458c7d642e6ab5742e27e368d93/96702017928.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418e53b113c---pofukebibu.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/15989589522.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/xutoged.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d4d8259f1---xosimugomemabodefum.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mefobulumirifeki.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8c36bf8b---vimumeduzus.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/57640676734.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/93126897500.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/posukakuzuwelubapifa.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/89151758722.pdfIn PDF document text
    • http://terrietanaka.com/library/files/sowapunugelapizarij.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/75345555481.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/fufawevunajilubix.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/83254635938.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/71446791173.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/13670548300.pdfIn PDF document text
    • https://derfo.info/resimler/files/gonadexarededanesakuzo.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/xugenelikiluxipavo.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/83387458724.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/sepobefubobelunuratako.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145043e2a5a2---12728951593.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/guxijaxuxovavak.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/kolawukofaxuvud.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/16557846388.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lodunetamogufavewunewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jcheater+san+andreas+edition+free+downloadPDF 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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 10648 bytes
SHA-256: 0bea6a6dc2a9801639b860c10cd30c4f1cce4c71b0117f0df943435d47912b0d
font_02_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 18336 bytes
SHA-256: 0d32d6eca8f4b50e67260e1af08b6e92775050a31697323f9a720183bd6eafff

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