Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5feee9c3c9ef846…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 14:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f3eaa7e311f3cb7b002593c76c2dbe5 SHA-1: 719b738b905c1c8bf234f63f2403d5f2940ee33b SHA-256: a5feee9c3c9ef846d1ad00ba7e5ec3f2aab4f9ef9a64409e3fb61b3f4ae9a740
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and presents a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of JavaScript indicates potential for further malicious actions, such as downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://e-hematologica.com/users/file/suwubawadofavafenurofibox.pdf
    • https://ms01bet.net/contents/files/85326497373.pdf
    • https://papiratisk.cz/soubory/84449661990.pdf
    • http://moretonassets.net/userfiles/titokotiwubesizupifa.pdf
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/83966203294.pdf
    • https://photofetimages.com/bigodalu.pdf
    • http://queensparkview.com/image/upload/File/wusubazudusifefegumuj.pdf
    • https://westhygiene.hu/editor_up/22572400981.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e80337aade50b2a349de5d58226a282f/82675019730.pdf
    • http://aolisenjiancai.com/data/files/72107463208.pdf
    • http://worshipedia.net/sites/default/files/file/pazokinexuvapaxutokiv.pdf
    • http://stalmont.eu/userfiles/file/30824694541.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/66154294144.pdf
    • http://abwlondonblvd.com/uploads/files/51607053982.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/41340317549.pdf
    • https://99shayari.in/userfiles/files/sorekasive.pdf
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/95448076699.pdf
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/nadakabu.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5d89542715521ada27bf4d7e92de8486/24780208072.pdf
    • http://fbrasil.com/userfiles/file///89749012002.pdf
    • https://cabinetscounters.com/ckfinder/userfiles/files/86120538127.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/cd2e89faf740b9cd50ac8c778afb6b2e/51438871406.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/nq9dc444e262dnp9b48jht9h62/41002191028.pdf
    • https://hchoanglong.vn/userfiles/file/39783400391.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+v+download+android+free+full+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b32b.bin
f48a15d53c3ed551264f887b9d359cb8ac1dd0b0ea38fbc159fafdba1157470e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB32B 15560 bytes
font_01_sfnt_off0000da5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16792 bytes
font_02_sfnt_off0000f272.bin
724e90668b634c3f1d08344d774f1ddc310114661f31618016aa54aa3cf92b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10636 bytes