Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf56f2e0110100b7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 05:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8613acb5b762f8d8b91f8a9313464a61 SHA-1: 5f453069cc8ff8d9024de2ebcb6b20540ab7b7dd SHA-256: bf56f2e0110100b76c2366880c837bc7f35488826f553bf39ebee6bfeef81819
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or credential harvesting attempt, or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/9p2ah2l4oonctf8glh8mapjthb/69711065367.pdf In PDF document text
    • http://iltorg.ru/upload/file/12635099811.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/gisevawelisezodizosewof.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/ralukudigodejaxotubo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021791758552502.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb773da290---55700639110.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/04qejseubm7c69ke88dr9jjrk6/33834667308.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fe2a40990---67637137196.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/15017572306.pdfIn PDF document text
    • http://royalgroup.at/tmp/56441855079.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecb44d3f04---wipuxefuwepof.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac104eecb9c---mulefela.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16097cff746468---54430006526.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/40655998217.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/19996744584.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210628_A2219D39FF089239.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/19384228317.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/55634072956.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/mokisulivafamo.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/xavajawugo.pdfIn PDF document text
    • http://goldia.cz/data/file/93171201977.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/674470148.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/os31l2aj9opj182mt7a6tpu2oa/fuxuxosufideg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=extract+pdf+data+javaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 16404 bytes
SHA-256: 4a57a52ce9a584f742491f5a8378891e0bfcd28636585cd79aa6c445737f0aef
font_01_sfnt_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 10232 bytes
SHA-256: 391da40731d80816f349656c22d8d6208eeef6285cdad02711161e5743992b6e
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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