Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e91d70166a7fb2…

MALICIOUS

PDF

86.8 KB Created: 2021-07-07 11:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d413193af920fc0914b690705ce1281e SHA-1: 278dc644579ab6a69527e793353462ba094af212 SHA-256: 49e91d70166a7fb2b75343731afdb9611b330d393dce4d30a39a6be8a213b70a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of embedded JS and the nature of the URLs strongly suggest an attempt to deliver a secondary payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8co1g8rnjavufqp3mthho84vbm/pevebane.pdf In PDF document text
    • http://hzdshg.com/images/upload/File/xitoxuzajakive.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13eca5883b---golomadolekumanaba.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078a56115f00---zadaded.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607470d1a11e4---lixovupipetetawid.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b22b4e88bf7---rapov.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/55944418820.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/96002042690.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7pgb6gbe68fbgr86kj8k5eupju/51401500389.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/54835435488.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/42350061674.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d488bb0be---73045744446.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/jusuvemomorazawib.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/70492456068.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160887aebdc47d---jowobijikutuxawolane.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/kumobozedasinekujafajuke.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dfc725bc9---dujifikifefu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/49882746498.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/49858afffbf521e6853ca3fb01aeb8fd/42380481095.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/5104825864.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/tizuxezapavegobibutanuta.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/biserogoxojob.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e76ecb579---jisivud.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2cac6bf6---27758566574.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/jujava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=letter+to+a+friend+inviting+him+to+your+birthday+partyPDF 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_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 11108 bytes
SHA-256: 69b81f3d46cb38af74d8eff43f5996f0e47a521a5b0f167170d0a65709d1c349
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 16936 bytes
SHA-256: cbc1690af4e807ce9e1eee7b0231c88c1d15ef9877b6e580093fab5d4ecc16db
font_02_sfnt_off0001352e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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