Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e92f503b5e9f3c5…

MALICIOUS

PDF

87.2 KB Created: 2021-08-13 23:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1cd700affb9e9f0c86c8651caf4bcec7 SHA-1: e98d2ca6b06178727988b666be5546f3a9cd5275 SHA-256: 8e92f503b5e9f3c52056f4d9dfb42874e8424fa8d569404ece3a997270f6cc50
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing numerous URLs across various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary goal appears to be SEO manipulation or directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/pozoredidumena.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xepixu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ca125cfe---sukaro.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/af136dc0b4c4f1078a9048b1b98d7630/kezasemunagevibigabu.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/49080495675.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/2467959753.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/33769655401.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c892ac48---wuwifasu.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/zijinax.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/39068154258.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803e3750a25---jememagado.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/poxoku.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/4170031124.pdfIn PDF document text
    • https://sanidom.pl/img/file/97747795472.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ce697cb0bedab542496198104f72864b/sinawopi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b79c51a6406df974e6a0cc05f2da6c28/joxavegivugatige.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210604123841548.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3401ebd4cded56d4ada1c72874da850c/vojeleserexezelemi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1cf08e74---kekaforazulifaxis.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/914ae2ae98529554c23ffba2400c1b9f/xolatumovitabadedaxug.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/kifip.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b007d28be26---fejikijorizawulis.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf947cdba35---93932503619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=informacion+sobre+la+cultura+romana+en+inglesPDF 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_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10872 bytes
SHA-256: 8249f95512c68ef3133c2376f92677b51c57e9d4a4c28ae1c4b51bc1bee05ffe
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001214b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214B 17240 bytes
SHA-256: 334b65f148ac43c4765b15cc09926fbae6255a73bb1c5034e6d2d9fa3bfb15aa

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