Malicious PDF — malware analysis report

Static analysis result for SHA-256 04311654623749ee…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 02:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 72befbdca347b1fd958162da3fec65e3 SHA-1: d582f7388e4e7b6db53aac97b2f556f40d502f18 SHA-256: 04311654623749ee0425a9bfc1d55354bf8d2d7523b479c82d2824d283727701
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://koslita.eu/ckfinder/userfiles/files/73793765594.pdf In PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a2b8cdf74c249794e937dd93af46ee89/98864291253.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/76245076036.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jexagezunufurorired.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/benidalidevoxadebemifox.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/rexeredibovimunutizekobo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160732e4ac9db9---xunetunirelujurul.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ef55720f48b58f0073eff3f5a6d76bd6/43946662716.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/pajogumeneroto.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f7107a6ba7f587e6720d8a2bde52cdeb/73406196831.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3a4524d6f---liguboritum.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/zimejujaruxuxe.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m9j9oaqeq4tugcbas3vlnqolh0/jawetowu.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/28a221927bfe2f9b9aab4c7b4e849087/roxowupugapolevulok.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/af88229d8b0b34a62dd9622c17e81608/gevipefipulokowubojap.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/feref.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075af79ed747---zuzasotu.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/xokirapikonejimaladu.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021082615025972.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/60142143628.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/87628824139.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/83040246582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=arabic+to+english+phrases+pdfPDF 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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 22668 bytes
SHA-256: 203a792d6af9468348d18090f33646cd3f24d4c3cc345bec35e0167feace2619
font_01_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 11020 bytes
SHA-256: 20db6be4ac1eaeb5c6cd3f896e1947477a96b52f29c8cbde673db2d0f57841a2

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