Malicious PDF — malware analysis report

Static analysis result for SHA-256 b539a42527a65834…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 01:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1d7f53ad242af5605ec9a2b1c5f54973 SHA-1: 2a3567196926753292148127576f8cc489073def SHA-256: b539a42527a6583400e47e444136a37690253ac1d979671168400c541a380b6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly indicate a phishing or malware distribution attempt.

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://fsanaq.com/upload/file/210626194853406251g8vuh95wgncm.pdf In PDF document text
    • http://www.radanhorse.com/resource/files/80094099185.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c459e606906---96013820926.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/69504590391.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mff1qlpq66ip6fuk02s8fs6cf2/baxijimeruw.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/01f19e726d07656ac9dcf7bc66c2a357/512760991.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/1621541147.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/70631554272.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/93294060749.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/jekasuzumufalepopejof.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e591a858f3---reganekuwax.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/dutuzikepapariloj.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d787fdb6eb6bf7c2394acf6a61407d0c/59843226986.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/28899646960.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc2b70e46---42326827951.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210630_5CD0FE191AF899A9.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4cb06c8f64c4c23f30d0ecc7dc8fd329/bijagoxawazevosibix.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3es4sn97vbh3oqmn3lr3m0keae/12224112088.pdfIn PDF document text
    • https://subarini.ro/mm/file/labegu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079904d09a2b---86297640388.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa69da245d0---94106435188.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/o9eh8hvn1di3rfim66ktap1v4a/mibexa.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/36227508364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pics+of+naked+men+and+womenPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 17120 bytes
SHA-256: b4fa0af5fb8724f60e7ada952d4fc0a290acdfeafd5bf4732b7199ec65ebb9e5
font_01_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 10572 bytes
SHA-256: 872990b43d5fcfc63f1781655e7e979efecfc633490989e322b2b3ffd17b7da9
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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