Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14f98c410bc6f7c…

MALICIOUS

PDF

90.8 KB Created: 2021-07-04 07:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e16669c92f9bfd0a1658595993406af2 SHA-1: 50f9771efec4c42a88c7c4a9be2948fa7ee0b95d SHA-256: d14f98c410bc6f7c3c83d1f5429a8dcead3a82def608ed1e46a5a52cc6ed9f5c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. It functions as a link farm, directing users to numerous compromised websites, likely to host phishing pages or further malware. The presence of multiple external URIs and link farm indicators suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aslimitada.com/userfiles/file/63770182089.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/24f6d8e0ab0d0b17eec57bbe95e58b64/92927229750.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704871d1346---zukumebigifo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d5888029f.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4flu61uqte4ia3cqs3bi3c1r2s/57108072811.pdfIn PDF document text
    • http://sro52.ru/uploads/files/vopemigugubiv.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/38730073289.pdfIn PDF document text
    • https://limsurempat.com/contents//files/lowaxamupiviv.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a28c6301b473726ba5fd989538c9ce95/tonoserikarugililuzazabuf.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/15563350968.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5ceb1701---pulixowonujafediribuputa.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/jijowexisitikedovukaf.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0be910664567dc2e8a01a3f74d45842b/2669357226.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/fokikire.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/v7l5n22hictf4tslieej1dm1tf/ropugegu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/bbb4c0aa1765a03f738b26d2bf18c935/zadijiwuvo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/toxemafugamedonurapab.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/588233b0f62c9004089ed383b9c27db4/peroso.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xopivareranojesikisiken.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1af2ac793a---tizaxilopurolimesobenezuf.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948524d1952---99458621654.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/fobapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=shows+in+ho+chi+minh+cityPDF 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_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 21856 bytes
SHA-256: d2e0d6a00a47d40f5df2242f14dbafe9b4eb53433227f8650bfb6a48fb2798f6
font_01_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 10328 bytes
SHA-256: 8a79e52187397c18ba2d6045e550409e4cfb03656762476fbf22f659014416c3
font_02_sfnt_off00014624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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