Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a67b4e95e551450…

MALICIOUS

PDF

86.7 KB Created: 2021-07-04 03:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5413ea4fa0cbf530f2561ed5db3a8cb9 SHA-1: f5baa2ce5f13fe1c51b660e4dbafdf8de531202b SHA-256: 5a67b4e95e551450c6924d9f52e929bcb8c1bed208fa8143b4ce4aff2549b9ac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://anhuicrew.com/upload_fck/file/2021-4-29/20210429120223553942.pdf In PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/02f6a0266bf5f50d24b14d95cc443e4d/69556852226.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/81339468780.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c1015be00e82dafd38b8edb6ccc89dc/21668458762.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/oot98c4hemhcamdncbp8kc53ja/89517296175.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/rimuvamogi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/61cf2b69025f373a4c574b48b51d4b72/17535833250.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/dfd3034302df3d248640f80b67a630e2/12325934761.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/68410117465.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/92022630503.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/repikuxuxafisebulopowira.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8ce2652---powibofapanixujig.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0575370c8cd838aee43c4bcd92d06a9d/rakirujunogakamulo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f6fc48a6f56b03def2baa0f1e392ffe3/80997227942.pdfIn PDF document text
    • https://luminex.pl/upload/file/varuzaguwebarilaxuginatod.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3a777a08---lakaganikufokimuveve.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/rebiduladogufu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b23e1b34---60481748118.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70f1d2735---17072561676.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0880f543---soxamagixujawesav.pdfIn PDF document text
    • http://adveotec.com/img/file/89242571976.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098629c03e69---loguluju.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/47215207671.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0b9b249308fde330892abeb5d42346f0/deviguli.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xetuxuxusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jimmy+g+49ersPDF 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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10272 bytes
SHA-256: c89ff4048448d94a3361795e6bcc21d3d30f5a254139f598b8aeaf5d5ce00a09
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 19112 bytes
SHA-256: ab782b358d212f39adcedc2c9542b51c91914d2ddb9176441f9a21ef127a75f8
font_02_sfnt_off0001345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1