Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f711e8266e2e3e4…

MALICIOUS

PDF

101.8 KB Created: 2021-08-01 10:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7bd6931714571ef7eb9b94da1499dc7 SHA-1: d2a268a1b291ad620f202b96cc213092292d637a SHA-256: 2f711e8266e2e3e4fcd627d52cb0c380e4423ab23e8edc2b8d30fb6a124de934
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content or initiating further attacks. The presence of a link farm pointing to compromised WordPress upload directories suggests an attempt to host malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://glbtrader.com/userfiles/file/96744862887.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/dd8cc3b7a03bdf9edb8ff0aab51ed2a6/61528762766.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ccee4a113064a69f0de7d9b0faad44b8/vafibu.pdf
    • http://chnli.tw/CKEdit/upload/files/77314257328.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b293b56b67a---76834409725.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/e1t1lou0b6pab317kaelf9l2n0/jezovufibukoxemiwakuvep.pdf
    • https://armagedonspedycja.pl/files/file/fagovixaw.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zumizojaxex.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb42c09689---kupexabijuvumugototupofi.pdf
    • http://malachowiacy.pl/files/file/24515735432.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2b86833e4068a5a0e8f2a0eb0ae99896/lozim.pdf
    • http://alpinedelhi.com/userfiles/files/tolenevafabazonem.pdf
    • http://cathayred-csr.com/img-cathay/files/melebinejemifosirifozevaj.pdf
    • http://daoltrading.com/userData/board/file/wukoxekiw.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c1bd2e44c---zajororolibuxomojoxejipel.pdf
    • https://kidneystonetreatment.in/userfiles/files/nofonoj.pdf
    • http://auto-spec.ca/fck/file/95375188189.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nr3akqajrr2jq47bc5h7bqasbk/17218089716.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c93cafec21f94800981b86ce420e8fc8/livezeganizunasevawejoke.pdf
    • http://eaupureinternational.com/userfiles/file/kojanobezometawetenejaxa.pdf
    • http://shinies.ru/img/lib/file/19562604502.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080e693c4214---jajewebub.pdf
    • https://amursvoidom.ru/media/files/texalavina.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f814e5dd---topizidoli.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/pibakikikane.pdf
    • http://yesilderecine.com/admin/editor_resim/file/23751715106.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sqlintegrityconstraintviolationexception+db2+sql+error+sqlcode%3D-407+sqlstate%3D23502+sqlerrmc%3D%2An
    • 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_off00011496.bin
cad379a08a2c78667587c75529622f4222bbd112ea734ab414e267369ef8b1b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 12340 bytes
font_01_sfnt_off00013228.bin
8dd3130717807d773793d1b158ae57cb7d7069989870856ebfe72a0a96b4eb9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 24644 bytes
font_02_sfnt_off00017012.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17012 16792 bytes