Malicious PDF — malware analysis report

Static analysis result for SHA-256 78de4f084beb2fe3…

MALICIOUS

PDF

85.9 KB Created: 2021-07-09 04:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f588fbfed6517c49d78b01b46a3d5858 SHA-1: 680650c2041944c7aef5b7a457960e73f2b8e0d3 SHA-256: 78de4f084beb2fe3101c2279734ec73b058ca16d0f46db5f891aa8888a42c344
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it functions as a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/8f5571hao9clhsh4bfg8jc4093/65618325852.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sajupigaz.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/610138fc8f386ef3ffd8d06280c8d08b/84368532425.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/gasuvimuzafanoxefozuxa.pdfIn PDF document text
    • https://afayl.com/userfiles/file/ridinemikimowifumomobi.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/melotatu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/415sl11uhnisel6klt82fo6kj5/63654984264.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160893dfee7945---6854933239.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a0cdc6442063faf5485b234838496376/78719769858.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/14303789658.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/cabaoheqi65ilgtm2o3brhkq84/44596769416.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/3079720023.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/eletfrionpe7i2h8bg81934jqm/nutesatinolulopas.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/5368310024.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d0d468a2---49361935802.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e17d5a791397c322ca423cc473f99831/97091848852.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/peq7basi9t41leomd9v5i3bc0j/sokogizafamakuduxagiw.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64b1e6c98b---gomuv.pdfIn PDF document text
    • http://distributoram.com/files/file/piwawudanidesejusavinera.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/68583016415.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe1f7864e3---koxudogipige.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/xipulolivivunivoxusa.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa61ba2e6b---70467451058.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210519162139244215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=criticism+of+kohlberg%27s+theoryPDF 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_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 10928 bytes
SHA-256: 96bd6c1d05213cdc5c47993975ee960853858ff0b2fb0adfe3b060647938b495
font_02_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 17956 bytes
SHA-256: 7997563dd816630ea67f6a61003586add55b924184db6b6931bbe24382a24f5e