Malicious PDF — malware analysis report

Static analysis result for SHA-256 de12ccfc571f167a…

MALICIOUS

PDF

79.1 KB Created: 2021-06-29 08:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c4682c1cedf72dbd0167bca2dcd6091 SHA-1: 6db9154479ce4ba11c7679785fe675ff47195632 SHA-256: de12ccfc571f167acbacbc93441e662eea2610bd752930beb67fa88b96e0ac17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://philabc.ru/uplcv?utm_term=inserting+endnotes+in+word PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/hs8v1kpi2eftb896e48e9fhnp5/mujurez.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608507d6cbab4---jozavi.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/81069865798.pdfIn PDF document text
    • http://sb-78.ru/files/file/wiwesol.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/saxogiv.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/354d2de89456fe95abaf38fbb4bc4cb7/54340827132.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0ac40777564f5106a315464904cf0f2d/zawozolanonixinonukit.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d933ce727---827682605.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da45123543---xiwaxedusab.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3440ef8a---35461111341.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91f76a020---nedagajezagefaga.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/punukukipa.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac77593a731---87830406961.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/kisetepuzux.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4363675a25---94516917765.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/r538b8imgp3ib7clskq3d3n3a6/99238885165.pdfIn PDF document text
    • http://accronline.com/userfiles/file/4230675782.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1471d2f1b1---5404425207.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fe5bsbqaoneeh0qfd9m8443s8i/38616747875.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5756781328---47391905590.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ad41f5dc7ba---69644722439.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/27525487568.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/44244331201.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c919f4446f1---fegosupaxe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/72186bbf08579d13f51eef1ef4e036bf/88806601028.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/18154537779.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_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 10252 bytes
SHA-256: 5ba14980a32ad713998af5103a957f0e130aa366c205ec11cfdb0b773df5714c
font_02_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16420 bytes
SHA-256: efacda6830ecf5b27963fd18d10984fdce21dfc51743db3e654ec1aeccd06e92

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