Malicious PDF — malware analysis report

Static analysis result for SHA-256 caff2e38e9201725…

MALICIOUS

PDF

92.8 KB Created: 2021-08-03 11:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71e88e9c5bb361f46b760fe5c15a36cc SHA-1: 53b92820b949e6e1e3ea721dce9b6d1e092baa1a SHA-256: caff2e38e9201725961dc3271340506bbafe8aa3b8c6af85784ff4be397cf795
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb403eb886---54503906138.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/04312066da29221a87bc30010754a4ff/fusimigawavuso.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f2e3rqn771oi3055kog2u66e0i/28874000896.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/mirepazizej.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zawijefej.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/vakevujuzorukagu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3954cf52f6712ae60a408bbe62413235/96239193374.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/271979736.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zixodaraworej.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c261c81d03---1702109584.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/62674186507.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/a03iv8kftbd0i07mba59n8l2j5/15914831801.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jr4tq687k0mg7nm01dka2o9qdp/dutukimiwesulixararuxekow.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d66846fd5b0e9151371cf0231399c49f/rinoponawewunizulelu.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/zixebifu.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55916322867.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/251416f2a4d86488208eac0c25ab427c/53441980441.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dfcea46f5fed9dfda73c8a13eb09aa05/bilobowisubofesimizukisu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0672313f0f---julukulojewokobufinal.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/fobaz.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/56287629193.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/tozirenunagel.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/dizolaxepap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=calcular+el+calor+de+formacion+del+acido+aceticoPDF 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_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 17136 bytes
SHA-256: e6159648a16a8503c573b87a838d4c1a4fdd10fb71db7a105b0e9abcd939b391
font_01_sfnt_off000134c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C4 10600 bytes
SHA-256: 8d0769356212050bfdc7f9736b8f401192d5d1897f59267adcda3b78594aa443
font_02_sfnt_off00014cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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