Malicious PDF — malware analysis report

Static analysis result for SHA-256 123d9d394640d447…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 09:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8824aa69aa73621b4b651183535dba2a SHA-1: 6c1a4a746b728d02d3e3f70b3ee60c5f868f1694 SHA-256: 123d9d394640d447d71276edf2df0a2f919d61ea63a6970f93c6a0266882e49f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://dlikefulproductions.com/clients/875850/File/xotuvok.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160726517135b9---midanofapinepewebifurevos.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/fidesarasulipesuratida.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/96439689855.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/91975154127.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090221480773499.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc60fd64797---teragokutipulowunozuwes.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/xomoneken.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d57c940b24b---95330664837.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67a41ce03---bofowizasitejamo.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/23581670142.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8875f2eabe---4307644208.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210717_B1EF557CC40F3CEF.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/eeb84167efff55ed1ab77fe6821d9b97/50792936213.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b21dcd295---xodisetoxew.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/445d5588ccd12f6deabee81ca68d3a45/74434722853.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/43516165927.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/76146551232.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jibanoxudemufapoxegika.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bdc18872581f512cb7e50b4430660a60/4396333091.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/molekumagiponadosajejoz.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/318269c5e37a1839ff90160abe13837a/bowog.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/59f30541dd4a2c1da6a007552f173ace/patonezosabip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tepung+jagung+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_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 10244 bytes
SHA-256: 5a7f3492a4b05c729e8d41bb715202a088772e73d2f80d45d20485213533844c
font_02_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 17276 bytes
SHA-256: dacab1d121d7e97d10de1cfcbf79132b5d666e9828c2fec8d1f7b97967fb6106

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