Malicious PDF — malware analysis report

Static analysis result for SHA-256 6919cc87d74e4e80…

MALICIOUS

PDF

88.6 KB Created: 2021-07-10 08:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 137f71ad7c175f2701713a9421e936d2 SHA-1: a0329d45aaa9c7a3085f7cf771b211b91c003b24 SHA-256: 6919cc87d74e4e80208bbb30f74d8b1fb18528a2fc8eb093d22021fa28a51abc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://jnvhardoi.org/ckfinder/userfiles/files/wakejuvid.pdf In PDF document text
    • http://cnokorea.com/userfiles/file/13012245848.pdfIn PDF document text
    • https://casentinoshopping.it/file/82875692406.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/53616918375.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/afs4uhgpg1s0trhk41hse533f0/92335323606.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kuzagojuxorobon.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16075defbea905---lupakukinijopufitasagam.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4gkv7gnq65bulk5n2am547pttg/nureso.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/20843215665.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088750414d27---62946514875.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/jiwiripubiwa.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/9126056342.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/fevirofopima.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b420be2cfc2---68681249975.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/84032320529.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/20njmbpi0qst2gm4qodldhspcm/48030628661.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56e61c4b1---12597583496.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/nilubumigurinujeg.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/rutekapawixapulobikeven.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0md2fvl6so7e8c5lhn1olqu7l2/zugetaxuvo.pdfIn PDF document text
    • http://unsersohn.ch/images/file/nupukelobugugi.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f31e464ea4c525586db06e615989a89f/lefipaxotovigapatonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=examples+of+parenteral+drugsPDF 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_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 10936 bytes
SHA-256: d36560358a77199e3c5b8df047e269be133e9b16ab939ef736f44730d1bb7535
font_01_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 17080 bytes
SHA-256: cfaa28e9a9f0a9bec36695609b68979cee418417ee8c52b5fa88cc21a6583d0a

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