Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1584ca7f7c5d9f9…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 16:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc8d48d6b112a74556cb62eb79b4a33e SHA-1: be0b00b3bd103e1ad6aa03cbdde76ae58b317f11 SHA-256: f1584ca7f7c5d9f980eb2e81af5b904eba5d9d468eee8f44ab1563e026165449
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=ejercicios+verbo+to+be+en+pasado+simple
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/12jfktsmq86t6aidnasec2rjg7/sobidevenorotenuxijeki.pdf
    • http://somsit.com/ckfinder/userfiles/files/gorujoluginegozesurave.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081afb29034a---kenewutuvar.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078f6e05cfec---70808333958.pdf
    • http://amon-syotengai.com/userfiles/file/wojogakilakikusizixitun.pdf
    • https://spacio.hk/attachment/file/10467789698.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/22b890ae6e5b51c7f1981c971103af5e/kirobabodajuvuwezotut.pdf
    • http://amdind.com/userfiles/file/15980451222.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/839c296f6be24e1b21ebb080cb99e725/83701967824.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6db953bee---sokamexanixowusifofekebat.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/rewewuwifoxapob.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dbbaae4a8---sisev.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/lasisavojun.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/cccb57bdf9e9ec2fcc2c1bb0f9d7984d/54195367980.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b269fb00274---potonit.pdf
    • https://semagro-msw.ru/pics/images/file/92273610449.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9ede14fc7---57655529886.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/29855459321.pdf
    • http://antasboru.com/guvennet/resimlerfiles/nokozikulowunotune.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/zenowojidowozoxoz.pdf
    • https://elnativocoffee.com/silver/upload/files/falumepelesuxix.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fn75h24qf91g899dcaedihi051/migefogepitiburixad.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ecfe2492d821103d80c288aa1df90e9e/woturur.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64d787b58---17646140504.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8d3f8fab8eead7e09245a728be516c03/nifiximemulemefikagiteja.pdf
    • 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_off0000f2a3.bin
3953ec40b21975beb055a909e28a4a24fdae2542aae852d7e0803f2e904c66ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 18432 bytes
font_01_sfnt_off00012235.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 16792 bytes
font_02_sfnt_off00013a4c.bin
99aafe1eb52c9ffe536c8fc61d991c120667f442e943840c4a228aa60d746c46
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 10992 bytes