Malicious PDF — malware analysis report

Static analysis result for SHA-256 489adb40e6f5cda9…

MALICIOUS

PDF

82.5 KB Created: 2021-06-30 08:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6735cdd18bc7714148ed80cff2d13e62 SHA-1: 15727fe8a32de01d073a411b6f3fc987f83f401b SHA-256: 489adb40e6f5cda95cd98d61be453285a2aaa4f2cdaf74f67e930b8be2fc2a70
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific intent beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://hi-techfiber.com/userfiles/file/pufamife.pdf In PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/jobobopamuzedexuxawanetu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rrudc0n7b2b7i79eriamkdlkbq/pesukazevutigizilepev.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eaa5e994b721b21bdba049df41600fe8/18645028517.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/modafasavidakozifebaw.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51db1f17f---15518982498.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/tolifezijigabara.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a0397bc8c80---45824788119.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xovorewujujudepelodix.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fejimokubowalosu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb58665d94---70224794397.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/46520563161.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1376afa21---22730313112.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0739acd9b5faceafeaaa104eff6c19bb/47886348976.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/089b4f1cce9a50a31a05e6051fc3a300/88984322785.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee9616909---30416082855.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090805aded40---bomajagafagiso.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16096818d5b45c---majirabomoleka.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fbd6635614174dc12c3c733fd62bea79/mozirizosemerexun.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/406784a5d7ea8bbd7205063344e2a9b3/26836469735.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/8974614012.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/a937m3em8f6koruimrt3nmaqk5/74718350458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=initialize+list+in+c%23PDF link annotation
    • 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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 10016 bytes
SHA-256: dc446919e277bbaff8e0ef91cae0b8df2ac1078bfd68a6f3d118edebceb63efa
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 1900 bytes
SHA-256: b1ec494aa8406f97f0fa1e39f253b83996f2344d59dcf65ebe63bb01d788caa1
font_02_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 17460 bytes
SHA-256: 4374804b5b0b20636b34c3c2bb1adbd676cc42f84729c3abf45989a50f950db9

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