Malicious PDF — malware analysis report

Static analysis result for SHA-256 44578e359ea03aac…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 23:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd4967f20498bb99aa7c679078aa34ea SHA-1: ab408e19d83fb29c156f208cff95cd19c6462f5e SHA-256: 44578e359ea03aacc52d845587d9dd0e772ebe07b97267517829bdc067c7b52e
204 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for distributing malicious content. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to paste content into a command-line interface, a common tactic for executing downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://nextgenship.net/upload/file/20210523162174542571.pdf In PDF document text
    • http://siripanyalamphun.com/user_img/files/60295488.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/25945075724.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1c5fc25b88f799d2cad5eb0343bb9229/tuxuno.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/85241129693.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1ad636fbdca01f72fb0eb7db301d8902/94651014062.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57dcb207fc---weniruropu.pdfIn PDF document text
    • http://promador.pl/userfiles/file/38504985375.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/2e918b352d7486c65aa7ec9b9db756dc/76890901621.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/13884348907.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/75413469332.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-21/20210621102015195408.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e17a59fb4b---24054749487.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/23466242277.pdfIn PDF document text
    • https://beaszemin.com/files/lekuzuto.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7f5504c5083a44c0792709c72af1e868/kilujezojipeka.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/18872641040.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/24ef0815447de9e48a551ff4f1201c7b/87949754326.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f667ee3932---56796087966.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/bupisenomomit.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///fasejuxe.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d739380707f---61218022332.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/19461583449.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160797583b286e---94143915521.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608905e50cf3a---7753766085.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5cfc4768---7302897453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gabrielle+moore+free+pdfPDF 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_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 19016 bytes
SHA-256: 0e3bf61d48d1b6ddc98724eac0509cc1c2a083831ad3bb4482879389446c2bd7
font_01_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 10468 bytes
SHA-256: 843dc63512df2861e5ccc5eca6f2886ec022e42a7d5f99aef5082b40273d74b3
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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