Malicious PDF — malware analysis report

Static analysis result for SHA-256 1834e7cd2e2eb046…

MALICIOUS

PDF

91.1 KB Created: 2021-08-03 18:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d41e281f34db73dc05d1129d37c8644a SHA-1: a6233ab2d72dda5a40aaa25d0eb4173db3f424fa SHA-256: 1834e7cd2e2eb04636dff593d7c060eeaefdfa58abd23e99c104ef4abef05453
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rugsinc.in/UserFiles/files/vixavagojokajutafaro.pdf In PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/29448698567.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u2k846vn3g77jvegn8cnp01tso/93959715526.pdfIn PDF document text
    • http://congtyvima.com/images/Download/muvuwutomemamovatona.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091225b862a6---ralujosagitinegasutevipof.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/n2qn02de1lrjlq98fhbahe793t/71192887762.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/jupijikebujupudirowek.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/wowabasufifagonuwumisagad.pdfIn PDF document text
    • https://capecoralliving.com/media/file/zixar.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ba7d3e3629b3513914b322260c2dc6b5/nawapedivov.pdfIn PDF document text
    • http://slsnn.ru/content/files/20078635790.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/nowawonatijufilopesuwer.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/84763548787.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/38484675938.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qugi8t11ijggil76a1qskac8rk/41827682931.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/70074712796.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/22522306888.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/89478623869.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10335d78d---97301190556.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kenafowobopegibogib.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/lofemokewoxuxedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ap+biology+chapter+14+test+your+understanding+answersPDF 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_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 17080 bytes
SHA-256: 538d8d03973db04aebc5f52af7b221b67372204478d7dd16b55d988e2c3da32a
font_01_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 11344 bytes
SHA-256: 9f06b51bec0db4a2e54a83395da647f4f78848ce39aae017c0a36825b19ed192
font_02_sfnt_off0001454e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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