Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff198b447884e49…

MALICIOUS

PDF

109.7 KB Created: 2021-07-03 22:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f5d034a027e6c6ebb7fbf9bb6d2da42 SHA-1: bbc9463d9171c5f44143034f1bbf51b08e6838ad SHA-256: dff198b447884e497778579fb381cc5ef2b607742483e49c22a9faf92f4e8e8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous compromised CMS upload locations and disposable hosting sites, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://sheenabusesandcoaches.com/userfiles/file/14461033888.pdf In PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/mazuki.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160808fb7091ae---sejasakegekolipudenesorag.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/79804819558.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/pibok.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/02e9a0d284364e7d46bec9ca4267a494/82325313975.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/cf3cf9242030b3410d9fcd0b6c163edf/66350328507.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16202925703978.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6590e860dc22874fd3ad604e1d719579/84470753176.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/20832937647.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/subugi.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/dazobigunidi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea416e441---bugerinazexewenu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zofinirojafunujivexe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/damakobitebakevosutawofov.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hstfrj237utsrvjop8tg4c6sfr/98623560160.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/12016861577.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a8bc673a0---bumujirapazalet.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-17/20210617142444316219.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/26113626209.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///91443518791.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1mrl6716a1e08m7ibp9and6n06/72958833434.pdfIn PDF document text
    • http://classtool.info/upload/files/wivefazajolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=animal+crossing+new+leaf+apk+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 18924 bytes
SHA-256: c8167d1a9002b887ff3cac26c2403a00f8eb7e11099500b279f644fce88e7935
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 11024 bytes
SHA-256: ca18b0a71ec80a819784b986e2e2d4a7b09e443d57e0265e0c5a60b30086105f
font_04_sfnt_off00014a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A80 31764 bytes
SHA-256: 4d3fa2477e4e6ecfe782db37e2299aca45701a514beb2336c64d9fe8e450414e

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