Malicious PDF — malware analysis report

Static analysis result for SHA-256 82898aea51d99ac6…

MALICIOUS

PDF

95.6 KB Created: 2021-06-27 23:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9acfe5253765e907ef0be33846e2be2 SHA-1: 9d00c2675fe5a7666bc94a1901e72e9d3c1c34a7 SHA-256: 82898aea51d99ac649ea440f049e398972ec3b3e3f00b44aaa208e3b462c7ece
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into phishing scams or download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://huntic.ru/uplcv?utm_term=line+integral+of+vector+field PDF link annotation
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b296bee36b---25475674282.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a051f7825c7---8452479897.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49ebef4f8---22509846405.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/45785192946.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8ff48ae913f758bd10a9d6c3a0922cf0/zusozanirenalajulowe.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/20862272736.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/83081916185.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/refixigilaxudinozafep.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2109199f---51072966646.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9248061539.pdfIn PDF document text
    • http://computerdoki.hu/user/file/81459169158.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c9efbeb2f0e---bodumapazexunanujud.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/93d1ad8d18ab50185321137a4cce2622/52402244763.pdfIn PDF document text
    • http://apsons.eu/files/file/xetelibixowimub.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3215024c---77508969039.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/56457413664.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8d064390e1fa28918fdf756cfe3aca39/25736459106.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085955369818---46582813731.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/69799334251.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d026270c5---9158667770.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/mixizufitageg.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/28b9b7c10069b8eb997dcaff92f83be2/44707573058.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/27244711107.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/43646000389.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 16284 bytes
SHA-256: 208adbe6720c1c2bb60f2d297a7a39bc35da7ca29dbf0f77a16e5a1c38509cbd
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 18748 bytes
SHA-256: d947376b4a9624324850287fa08e7bc0921ce4f5d8ff383cd4f3f612c98ed92e
font_02_sfnt_off000140a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000158bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BD 10508 bytes
SHA-256: 3736e0013441e7f3264d596221032a47dea5c830aefb1c242f66dadcd17ef50a

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