Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c688c630d615d74…

MALICIOUS

PDF

80.7 KB Created: 2021-07-22 18:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cf079913f0be73ab1732b23c8182c355 SHA-1: cddbcd6b1a92476b80033d255dca9a4ce0806c37 SHA-256: 5c688c630d615d74687eefa78ae40f9c75ca4d2dd53b58d633b9b6ee658adb25
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdb5ce305---6295747899.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021060900212926.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870bc7233ae---64647089254.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/7483244198.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae03f1f81---ludamezugumaxo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b287a699933---guxig.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53c1e9f34---penokoganeritine.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/88901679655.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/25702542509.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/fisumekotitipokakabit.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/vkuas9cp7baie4kh1da970q81q/40620354931.pdfIn PDF document text
    • https://tckontrola.hr/files/84820382521.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160930bab66fe2---zozijotubuju.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9faa7c17a8cccb743a15a4813a45e5ae/97951319259.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/09f45136b9ab52456e57116760a8d337/77285012549.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/diwugozefogezi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89650e0a2---gasusulujuwokode.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0fbd0e1c---vinunefik.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/fowusonakukutuvotibawugig.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/nufudaderebexugorela.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/70164683430.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607182e2cab14---77207418481.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/rikifuselonoterupekidaxe.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/baginag.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3f3aef26---26736526976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=please+advise+whetherPDF 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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 16900 bytes
SHA-256: edd6fd599ef1cb9df79648baae419be2e818e3bcc4a823f9abd7867903df1ffa
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 10276 bytes
SHA-256: b307c0c89a0d25d727dd09b1081787ace8ee3d4b4b27847b4e13a50b13aef643

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