Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b794f6bce3501a4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 12:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4655a23e919340a48d8ae4f885813e00 SHA-1: 41d3f654251fb7f70c1a783f63533af7995ae008 SHA-256: 9b794f6bce3501a427a9da3e6fcb75500ca7b5f6cfef4e6ad9b7e0e772f21db5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous external links strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://interno-kazan.ru/upload/files/61646109884.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d11ba153---jaduxewitamuniliful.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/32798995151.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/wigazevefavezakasiwijad.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/23314155936.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8e81f24db128a1781e15361ce5b0e96c/48229015555.pdfIn PDF document text
    • http://beijingteye.com/upload/files/vuxomogumenoxenixux.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/vajewojikiduforopogupop.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/21df0a2e746caafc8715d8497f6c62a2/87469469143.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/40312520010.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/76335349472.pdfIn PDF document text
    • http://art-ball.net/files/file/29484412137.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/97109771717.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/pifudosozajixizaxolu.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/18718568212.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/49dtvirgt27p3quu81o66266i0/feketotedusufofufurotob.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0071019c---manuzuvitajojolojiba.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kabidizewokuziworamuzuwu.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/bewuximusozixuzitubap.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/busiveweravivejazo.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/69240763217.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/75463017551.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/33897322038.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/18/file/20210918_083216_125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=why+is+my+tablet+overheatingPDF 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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 10868 bytes
SHA-256: 5d49aa121f7b83f0c2cb924360c0fe8e293f85f36e4781f27bf8da75ad6f1c5f
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 17524 bytes
SHA-256: 47ea098293afc1899d2feb93e297363df426af64521e595ce3eadecbcd853594
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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