Malicious PDF — malware analysis report

Static analysis result for SHA-256 975924f41622ff31…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 10:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c45870d284027e8c00793296d6e81ad SHA-1: 9c5bf3f79857d06d65967b7b6a4e06608373985b SHA-256: 975924f41622ff31e75e1e66eee9827ab12e2cb3ba9e33cd3b404f6bb59e77fe
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5f5339d8---89786185955.pdf In PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/toxugojonenixi.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/26306175788.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/retow.pdfIn PDF document text
    • http://firegallery.ru/img/upload/69511553344.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/zegafefowefepab.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2578cdbf4604972ddb80c6b25291c369/wexadezoronopelibiv.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/81400922379.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/lesedabebab.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/ripowopanifad.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/21111975506.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614239bbc32c1---ketipitegos.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/soruwogijibe.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/vawofadajatanuziduxogesu.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210912112220725.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/saxojerugope.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/gewimebav.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/71290268080.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/83829259826.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/folipujewuwi.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/72070138740.pdfIn PDF document text
    • http://186086.com/upload/files/96959971192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=0365+smtp+settingsPDF 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10668 bytes
SHA-256: 22cf3c08c09accfc028e213cd84311279a3e3c58ee975b76a06f2d74d43eb45d
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 17584 bytes
SHA-256: da333f5b47fe40063587bd70c50e121f84f7dbb67a0daa98f810d74437bfd0bd
font_02_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1