Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a291f43082d9b02…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 19:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99219fb3bec5e11572e91150a9777fe0 SHA-1: cb10079da0b20a41efda28f5312045213b79a0f2 SHA-256: 2a291f43082d9b02690ca3e525687f549c71dbfd9546921c1d0be192da7d1263
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to manipulate search results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/46c470dcbc02c95020eec1f3a870af13/pufajav.pdf In PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/kosolojini.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfdffeae6c---72478354829.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/33293443925.pdfIn PDF document text
    • http://linza-market.ru/upload/files/62626307088.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/90653138475.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/24918878617.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095061190d0a---76177633794.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9feaa39a0f49bcb1df322720f5a1d32e/78542705374.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982bbd52867---26290311777.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/tadiwot.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd7178b44---suwepi.pdfIn PDF document text
    • http://esistore.de/userfiles/file/83815722732.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/fopiludip.pdfIn PDF document text
    • https://medtek.vn/storage/file/nigafozomamilotiku.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108700285a2c---naxixorumibo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5296cd967a---mufigun.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/80735251958.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92e0f066edc020a1ab35855e14e18ee9/zusazibikabume.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/7728844407.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/54460122212.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160947712b421a---rovuxapivuvakusebig.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/xexugejexodolima.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/26996983720.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f082649b489---22119596063.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/3476676343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=generala+reglas+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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 19080 bytes
SHA-256: 269adef608f03e007359f07ab4bd0a6a2c283e631722abc8b68d45ab3daa99d3
font_01_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 10400 bytes
SHA-256: 4d726cf74f1af0ef47f001cee32298479e6ec69b872bdbbb6dcb55ac62a4b77f
font_02_sfnt_off00012636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1