Malicious PDF — malware analysis report

Static analysis result for SHA-256 268502a9138bb4ff…

MALICIOUS

PDF

87.7 KB Created: 2021-09-15 16:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c49babebe261084ba60fefe8324b153 SHA-1: 271706c8ab7e0cd9c246187ef702131926a6f140 SHA-256: 268502a9138bb4ff2b28ec15d584a3fdd92f4bdd5855c311be2543ab1bfd13f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://philabc.ru/uplcv?utm_term=mutilate+a+doll+2+unblocked+77 PDF link annotation
    • http://home-hj.com/up_photo/file/35308670964.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/mirafozemuxuxoxovekas.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/joxut.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/66341786948.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161356846d7257---59151904473.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e0cc4c8a82bec99d60f3b3791d98f9d8/winazagilukititu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5333ba9a0---povafoluvorimetejonul.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/mipuwufipu.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/59670850690.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/bifefunigodezida.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/17444735731.pdfIn PDF document text
    • http://trubaopt.ru/content/file/mizowekojawuwuvimu.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/45892772926.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/7132953127.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/65448518392.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/iu2m1h7hjmmmc6bdvh45nk1m14/30842399874.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/sozikavofibifu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cntkhr9bdaqgf64pvbuqj4gb49/22845679794.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/88169994736.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/nesorusuboma.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/60579824418.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zarovefemepom.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091000532873499.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_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 10588 bytes
SHA-256: 2ede160da7c10a32169d5dbcb1074c228e1a81057bf8e68e0b378cd3cf3279ba
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 23388 bytes
SHA-256: 456c238e828484792088f10e7705e5dc81b884e5ce4888109df5bdfcb31d98f8

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