Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7504b66b2ab1d3c…

MALICIOUS

PDF

71.1 KB Created: 2021-08-29 22:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07eb2b784fac921486cbf6cc647f8316 SHA-1: ed43d42adc0807f83a2b2a43d9cdbb5a2ac8aaa6 SHA-256: a7504b66b2ab1d3c640cd7c86784c5a359ba9ae683ad5f2912e38137619d6bd3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=switchblade+legal+states PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cacd935e8---wozugufogiriranudugasa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7dfdae43---1853593075.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/9101772387.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a4603a27c6---xajejenozalesilerin.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/49813925635.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/xojunojadomelidaxatud.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195b702252---kimosutatifimojodizuzewov.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/82720032137.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/81960445490.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/52322497674.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/91570654838.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/beronenaj.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5490625ab56a86efea6904820bcc8fee/58019061396.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ea3fb6f7639a2a4ed7eb136e1235dc85/8435303609.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/37d4d355c515405a36ce79a041d3ae6f/tagini.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d772be3f6b4---65566390154.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/6367982128.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/q2r6uog36qkt672gkj04mifnu5/59065518419.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7482166b97---84727575974.pdfIn PDF document text
    • http://muszempilla.com/files/file/86693489713.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/20580345402.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/zubewodirasepivof.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73cc6cdf9---68431838883.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/39595980271.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/nozatezene.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/lezapujaxatidozowoza.pdfIn PDF document text
    • 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_off0000b87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 15148 bytes
SHA-256: 1dd33145cc71abcddacb9b558210c64f12bd48ba14690efc375ad94ececd9a77
font_02_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 10624 bytes
SHA-256: b4a7f83f75db80fa2baaa3c1acd738e3dd1b95c008095db0b131246fcd252aee

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