Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66487a2ef754a7d…

MALICIOUS

PDF

71.8 KB Created: 2021-05-27 08:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 869f9e886db1e7bd7a6ca1b305b26293 SHA-1: 1d141514eb8b87ce4798bc733400cbdf667fad38 SHA-256: f66487a2ef754a7d960d93554d74db52e3ea9f8b8fa4742ac1fa18107b54c0ce
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to redirect users to phishing pages or download further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160841e0f1d434---19159246966.pdf In PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/5e453d858c72958d11a3c49d334255dc/49136231168.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef75c6c56---kowisugigilusop.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608beee917142---77110582188.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/3nr12vn4ui047fja8vuf69of2l/zawesasanirujenojaxaj.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2656f529---93726375464.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/24447d1f28864fa10310f0cd78d9a5c4/wujozodof.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5ufs40mka8610in941acmovk7e/xenutufumive.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80ca46c95---zerulal.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7ip59u3dtrhldc0s5l765mtr10/99599530199.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/99cdcf017ad5e664d6afdd5baa8e4bee/tekotokobup.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/4fe62bd6c46ac99efadadfbf556874b5/setederexiju.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/3svluen8rn8lkmtc08ptfn8uhg/kimebo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ce89d1947c78da00c1b2f03cf88f2570/86159243579.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958bb4570c4---lemekazubosupunagewoboz.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cef7ed0b---27085512939.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098935ac7097---32622124596.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5a6a00af---69570043939.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa7c901a9---18663988247.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f857cd7c---65010628985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=adverbs+of+intensity+worksheets+for+grade+6PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 5736 bytes
SHA-256: f05d5186c0707c3973c0ee41a475b911f19fc6f4c3445c4e1cb51be978bf645c
font_01_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 11844 bytes
SHA-256: 30d23a76c6057eea579b54bea083b98d387653e5d446344af37ff7eb03be90b3

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