Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6ca3cc1978e61a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 12:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26b5d35784dca98f8b641f94ba337c1b SHA-1: 9b1ef7c0aee91fc77583756293720cdadd35713d SHA-256: 4e6ca3cc1978e61a110eb49ce50c711d19e091970c3ba12e893700797c6748b8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of 'utm_term' in some URLs suggests an attempt to track user engagement, likely for phishing or to distribute further malware. The document body is heavily obfuscated and does not provide direct user-facing content, reinforcing the interpretation of it being a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=slotomania+apk+2020 PDF link annotation
    • https://v-rshine.com/upload/images/files/44196750289.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910210442.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dd537c32---tupam.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021912101794860.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/ritemari.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c97778471f4008576da0460de7624b56/tixazekemiletupinali.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8397k71c0fseospalrkg21uo31/18684086176.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f57007054cde1599b5f8371ea76e8259/20120828593.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/18261136042.pdfIn PDF document text
    • https://parfumzone.ro/files/file/83145045172.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/fogazofim.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/33568731940.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/16eb314ba4fa459f3c1287be13131971/21373119745.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/55308212133.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410f26c877c---72140923984.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/laxofuvafigidow.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xupuzefikadinija.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/vunolipelazisezevomonige.pdfIn PDF document text
    • https://badrivishal.com/media/74448866627.pdfIn PDF document text
    • https://shunnasato.com/35180354992.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/xaxadawitewepubimis.pdfIn PDF document text
    • http://soc-in.com/data/media/files/25400923337.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/20438349510.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s27je8it5d5inkrkb0ccbm9210/riwavuvu.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/3080472064.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/94227981629.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_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 17200 bytes
SHA-256: d9afc062213909fa14cc160f1f08e38ea2740bbb616be42dab013013ee44bfa0
font_02_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 10424 bytes
SHA-256: c164585a9f86bf294de4c2b24b43855307242acf7ab2b3de397aa5889c417e4e

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