Malicious PDF — malware analysis report

Static analysis result for SHA-256 101c64cb19e33c32…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 19:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 747252f7abadae80cc4caea0f4658246 SHA-1: 537c6412b49cd0fa678b7b2911976f042349f8ec SHA-256: 101c64cb19e33c328b5e739c9f2ad899b472ad9bfbdf83d8e1fd6710e0dd3a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, strongly suggests a malicious intent to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://laborke.ru/uplcv?utm_term=introduction+to+c%2B%2B+programming+pdf PDF link annotation
    • https://intersat.lv/files/file/gibawugavanazaxodut.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/wasajumelexolenebo.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/diwivoxolapap.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ffe6d34700346f3edc9f0693560d7f5/ripopevewufowo.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109140546342325.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3909e8c2---61139976749.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210916094601.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f19bc4d18---loradolemerap.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/janoxuzezigikakisekor.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gubaf.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/83958279982.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/11405181650.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/bunafanopozez.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/38120698701.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/sepomamakovozaremog.pdfIn PDF document text
    • https://12shio1.com/contents/files/vusiru.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/80829834933.pdfIn PDF document text
    • http://coolscape.info/images/files/bibojikemikir.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/tarunovarafemorujupuwu.pdfIn PDF document text
    • http://idcla.net/upload/files/42456264703.pdfIn PDF document text
    • https://tigaintan.com/contents/files/wixidujaxajovajimikixafum.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/66943225972.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/42833794126.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/mibopi.pdfIn PDF document text
    • http://jump360.co/upload/files/20210912020952.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/87764062582.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/66384137275.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/51874936034.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_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 16576 bytes
SHA-256: d45e21ed703636774ac8c918e41c77784786870e41590c0fcffbebdaa5e80208
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 10668 bytes
SHA-256: 685d82194f84073bd20892139e4355ae6371900ee308f0701d6bbd320ba8e095

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