Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cffe607dc986e7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 15:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b49ba73ba6866717706e196898d00f79 SHA-1: 0e269ee095a7183dbb2e85366f682154a53c1adb SHA-256: 54cffe607dc986e79dec414b5505af01f14b0795f04438b7c1538a654ceb482a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. These URLs are likely used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=android+chrome+ctrl+f5 PDF link annotation
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c7856bf8---kesodafekewog.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/sekizivedi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/3248314312.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/83775812394.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/ziwubafewunobadejusudejon.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/jetevazuxuj.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/riwimunutiwididokedo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/fig2tv5jm5i1qudvgogl4ijlap/revijuwu.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/bipesefa.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210905_FD50D1EE3C193E73.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/palipelajakolunizuved.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/21859432255.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xuwowu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb05a49b24---kutuvobapezafufibukejinup.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/gigokavunama.pdfIn PDF document text
    • http://topp.pl/_topp/file/68398604930.pdfIn PDF document text
    • https://arerp.kr/data/file///wivevunorifuwisopoweruvej.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tp8ur6a46r2273q31ld2qlh4n0/81660655221.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/49245947600.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/zibedikifofozu.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/nuxonupalur.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/10379369780.pdfIn PDF document text
    • http://wsm.hk/images/files/kikedima.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/tevodemozusodepadojepi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a197172d1---5678719778.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_off0000b5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EE 10528 bytes
SHA-256: cc49de6080192979179099f78e8ac58e2c43897ce92409fa26fce5ee4354f1f9
font_01_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 17684 bytes
SHA-256: 219d0d93812d8bc779cc209b0e4a3ae7525a1b61054042099b82e3283cab9937

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