Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f57df1b5f613168…

MALICIOUS

PDF

89.0 KB Created: 2021-06-26 01:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e40819eca560b2b15064f30e93a620c5 SHA-1: 3ea3d516701a4a9f84ad9f4f79077ed56179f032 SHA-256: 8f57df1b5f613168dfbb4e6d910a3d195dab39d382fe9faec4f365a587e378f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the PDF's structure strongly imply an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=what+is+the+fourteenth+amendment
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6d600459---78104082519.pdf
    • http://euro-ex.com/laroxuwaloligekujuxiki.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0888c4f79---topaxomekivafizofawok.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/3010978049.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cb88ba3c61b4eb0e2ebd817ea778fe94/69330953431.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/075d15acebfad7f6cbf03e4754931894/fakikegofikevaf.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/86d4d20eadb9d0a6774e89cd6cc74719/wivoki.pdf
    • http://innotec-industrie.be/userfiles/file/vebixori.pdf
    • http://didocrosby.com/imagenes/file/xazupanonama.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872c3f4ae7e---14872674415.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b9608f995b814791c1d3b51328b1adfd/19318824132.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/75e48ec3a01203d12bd90f34b9fc6210/bagumusetixugexamagivewa.pdf
    • http://mywayrtk.info/userfiles/file/8535224911.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0j8b9huotjien304sg0sdmkq76/xexijefevoku.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5fe82112---831232261.pdf
    • http://akifkasaboglu.com/esatfisek/images_upload/files/47878667654.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2a10b1132384baf0db6dfb52aacb867a/felabuponalav.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15e29b293---6561707508.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/55828430242.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797c0bbb928---zoseradanomiwifuxilu.pdf
    • http://asiadomainstore.com/userfiles/file/zefivatavinisefamikuje.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/592ea2355b76568546070c71e74dd352/kosowipol.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3934f124b0ae97604f34cd52a686f965/78911105457.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608646236eb02---tagowofisovi.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/781hv8253kcjqe04b90bmlcbdk/bememusafenelejokolove.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c100c2df---mavebexakevotajolukaxi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 16792 bytes
font_01_sfnt_off000113b8.bin
84b6250f0963e97bfc718dd81ca79ec8703eee8a4c4b50c98ecad99bcf085e0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 16548 bytes
font_02_sfnt_off00013e7e.bin
5c9754ce149527996da38c8956f088980ba3c3501ab9951b7b09026329ac04d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7E 10668 bytes