Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e51e18bb5ef6b91…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 05:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f6e1389f682bb31e2d56fdb78c35ea8 SHA-1: 3e6effc83101bb1a3ec6892fabc808332955efd3 SHA-256: 2e51e18bb5ef6b9124ebf7346aa828f8edf53847314bbe0752a89c2ea3327626
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and other domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest the document is designed to lead users to potentially harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://goref.ru/files/file/vajam.pdf
    • http://grandp.ru/userfiles/file/gozukusanowitirisul.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67a64a25b8---vobavifenadakelaguda.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/76bc63c062ab689d4a3bd212d62e521e/gofililewijemevejaterifam.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b53fcaa407dff6c18e3e08933eb9240a/jikotopuvogajogamusaxeg.pdf
    • http://aj-logistics.com/stock/userfiles/file/69345041786.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd7d9d34f3---nobejotimotuko.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/55eokpdq8vvpp4ddrtkbogb69q/ratikazi.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072de8d27c24---95386970424.pdf
    • http://timnhanhonline.net/upload/files/73132690706.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828a47b5114---pobijuralukafigividojopi.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c83hb65eqngn3eorvc3vl1hi73/18719948.pdf
    • http://rszm88.com/upfolder/e/files/20210617044320.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/92076595862889174c46798e69b3cd86/16901657631.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/fr2f7asjbheou539eevigevut8/35916904331.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a8d36f2a4d722fa4d348d5a25357858f/85361023053.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083dac0c604d---mugedokixixo.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5bba0fec---20542563745.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21422739a---tipogefilabumipawox.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b085ac7aff6---26802441801.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/skpkcdfstteuqtb6o6kbc48uh1/vogaduvuzikunoreguduka.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d84c5f984e19e33bd4c64eef0a0a87bd/gotutizugubolibin.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ju1up6u21cla7fabeg8o5se3s6/fasimaworijunomutosulul.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7aa65723---63844790397.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7e3296b7---kiveji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=drop+all+indexes+on+a+table+sql+server
    • 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_off0000ea6a.bin
3ba0fa4d7a3b9532101efc1d86aff79f7883577022554f787613aaa98867e8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 18008 bytes
font_01_sfnt_off00011958.bin
14792b098091da44b8a9fe971cd5c5ee358155eb50215b0253ab628d69b89275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 10840 bytes
font_02_sfnt_off00013211.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13211 16792 bytes

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