Malicious PDF — malware analysis report

Static analysis result for SHA-256 9599236a9f0e8251…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 21:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d841d5220832dca85d2060f2f1b556d3 SHA-1: 08190c8d79e67333b1ca4f80bac412f0d30c9d88 SHA-256: 9599236a9f0e82515d871bfc2cba4f7ba7ecf0f2b3fc5b573aabf269d2ee0328
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, including those that appear to be compromised WordPress sites or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to redirect users, likely to phishing sites or to download further malicious content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=slope+unblocked+games+gacha+life PDF link annotation
    • https://rajaketiga.com/contents/files/82561569407.pdfIn PDF document text
    • https://umutfm.com/resimler/files/94416153350.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/31047558687.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161393cf6100c7---17151431813.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/gagivixofatatuwulojanowej.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f39200654---tozukejinetaka.pdfIn PDF document text
    • http://houselandia.ru/files/65692613958.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5e77c3b1---vijokuliferufikumemas.pdfIn PDF document text
    • http://rld-carbon.ru/file/zijogu.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/pivojikegubepe.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/37819333280.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/68689866535.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/57685048801.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3e909965---92355271981.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/58236573699.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/42964790511.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/tasozizi.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/29256609590.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mabuba.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/gesumovofu.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/34889013477.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/8632309089.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9b10962fcf36dad22389404ffe716874/zomigebikeso.pdfIn PDF document text
    • http://artospace.com/pics/file/kojefolovamiro.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61365424d5e88.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F7 11276 bytes
SHA-256: 260fbc07b418ca09b1c09c7373a569fada2152c26d907c362f1a6b2ea89037c6
font_01_sfnt_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16644 bytes
SHA-256: b04819286181e33aa0ca89b8c6a948fc84249023f6399349fb714aced5955e34

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