Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9ab8467bad8583…

MALICIOUS

PDF

76.0 KB Created: 2021-09-15 07:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5967e222d8e18a852005b4c5d47d9a15 SHA-1: 7eda95b98db2d783bf46b4325f2b9155bc030395 SHA-256: 3f9ab8467bad85832541e40eb1e1a1d6d6049b727945b7d3f98b4fe42fc7c7a9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://allytemp.ru/uplcv?utm_term=grammar+corrector+app+for+android PDF link annotation
    • http://murasakijr.com/uploads/files/43846468379.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161370f9737447---togedozijoxatizazanivapu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804213533c---jasozilitewanasilokur.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133e56dc5738---dodupinujumato.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/wuwugusujufelezasin.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/bozupewisiwesezas.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/rovowevasef.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/23502252428.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/nonesivagisag.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/19960371190.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/kifemasabavijimim.pdfIn PDF document text
    • http://landpas.pl/upload/file/gizavitonabuliduselu.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/bosifisinaziredexoleded.pdfIn PDF document text
    • https://kawanmto.org/contents/files/luxujisaxipubaxurapafivad.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/luleledexorutememo.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/titekobolawesumusok.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abff56d155---bivubuligazakajup.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6f58c08a6b2799deede6127171dfed86/41308324249.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/80372384720.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210903232729.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/xolugifofudiwonubasegoj.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7a721d10fc05b406a2cf5307c1594fd8/26487877439.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/68853147823.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/76455572427.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/31823354920.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/43963781802.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/30fc6f804b382778f095c812ea18745d/17226392226.pdfIn PDF document text
    • 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_off0000c77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 16468 bytes
SHA-256: 5196d08273a581b033c7ca4fc0abb69164c15b6006d4f2a6f3ce2b7104af48bf
font_02_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 10604 bytes
SHA-256: 573713c600aa7b5c2bc437119714147807b80d75956cb1802ad13e87b8f50043

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