Malicious PDF — malware analysis report

Static analysis result for SHA-256 911652e552056f05…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 22:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ec8b04e4e0d136ec6eaad0925c80666 SHA-1: 61624f5c8cbffbc222434cc3a4beabcbf87c05a1 SHA-256: 911652e552056f05f7e6571a94e54d3f21ff3d9d0551c3fa60c7c1dc0a7d9c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 various websites, some of which appear to be hosted on compromised CMS upload directories. The primary purpose seems to be directing users to potentially malicious or unwanted content through these links.

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://krukewittfarms.com/userfiles/file/58183325851.pdf In PDF document text
    • http://linpus.com/app/webroot/userfiles/files/70081112304.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210524174252.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/lezeneribaxarimuzasuso.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f415377f---64450861739.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/govasetopoxoliwira.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16123c5682ed9a---76587690434.pdfIn PDF document text
    • http://salkim.com/userfiles/file/vokitadudu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/4e677a1800acdd755738f0e8919715cd/vesepunapipaj.pdfIn PDF document text
    • https://avenue102.com/uploads/file/romenodose.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d583969df28---siwufekakuxod.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/rbfndh8l9fe4o52is1kq6bpnf4/felitidudux.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/wapagiwawotilajenawexiw.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6d29318a6c807f1aa6ef89db07d8ce2f/66667282567.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/0c31b45a072587653050b47a52a5fff5/17292141238.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f805b96a7---sozakimaxixivulenura.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/desigp9pl2fe0l6a2bnqvo6ngo/98231420162.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1217cb853---duzimuler.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/4984951473.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/lajitalil.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/xogawofaf.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/27605006595.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/40314046895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=human+resource+development+plan+pdfPDF 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_off0000c0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 16620 bytes
SHA-256: c0d6b5d0b3392ceb7623f3aa17c3e3cefdba28f58a1eca94dd9eb62e5c906ed5
font_02_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 10848 bytes
SHA-256: a0d0b1f565723f493013e8999bccf22c6c3e4515ad2c4bc5f73569fd3636ca3b