Malicious PDF — malware analysis report

Static analysis result for SHA-256 792f3f6d8457215e…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 01:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: db8a60c2e1ac1aa304a6a9540838c5aa SHA-1: e3f28f17ba668a9a6f2156c40a705e668a42bac5 SHA-256: 792f3f6d8457215ea785f253433c58f05f12f43ed65d402057f435a88a938ba7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically related to phishing or trojan distribution. The document body is unreadable binary data, but the heuristics and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeaa212bea---saxojexafex.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3a72a0f39f278d7a537d875aa7b9480c/vutodupexutavuri.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/6kpmivtsugd6m2sv85e3qgssqu/jivinewonose.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/587bc5ed481215d509b5fab43907be8a/37874750422.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/38bbb4b23c0a36115282466551edd8cf/kuzafirovamidisuliwuled.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/91339273290.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/84790138467.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/07d96305afca21a63dc0b07b1acf8f45/xewidifisopebazuxu.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/5173781186.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd26b3797---zifunijuxagatatudi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160723f963446c---33062333366.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/lowidezu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/2461277526.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vosubilivawidujasarifetix.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/fijesulizopejofexepeb.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zavovosimamejagupojovusa.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/af8c5973be185e98a67e273af6b17fe3/50741187674.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0861989a2---nidipojevisivevulomozuso.pdfIn PDF document text
    • https://naoshima-habitant.com/wevuzopifo.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5375f6c679b1d8109eaafd94c37f4cd7/kuvoxogitudojegir.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607196dd7e0ed---nifok.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608706f8e9ae2---47339274156.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4555a69674c70fc6f47cd450bc241b20/loxulefijas.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/823df1404d07a1c1db559274a68385ea/jotujizinovisivemituno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=function+of+cell+sap+in+plant+cellPDF 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_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 18316 bytes
SHA-256: 341cdf0650955889cc6f17fb6c68f8a8937d2b4e9491b243d1e79a73843aa00e
font_02_sfnt_off0001376d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376D 10448 bytes
SHA-256: 41f4aea1af29f7b69c26adc3704c6d33c935803ee00476925d7aff2e8869d510

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