Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff2579cb230187b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 04:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef27882f8b28e2200600a1b60e900cb9 SHA-1: 8b7850ffc22f324165553db4ab719d930215f195 SHA-256: 9ff2579cb230187bf1bd3e7d2b4b86b048267d81a3120de76b8ade06785bed23
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://botaierpharm.com/upload/files/pupizobamupogakegazejeb.pdf In PDF document text
    • https://marblo.com/app/webroot/img/files/fexutube.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/2999080069.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/22754955185.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/21406409133.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/84247469456.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/vuralesamekovob.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/mibakujilibegitutuwuvu.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210901083638_512207911.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/43841767357.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/19695782399.pdfIn PDF document text
    • http://sbkf.org/files/files/jedalosukatorotorixon.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/06ge05l8r5fuodpo2d5vctvrgi/zelogufijumazezazetomu.pdfIn PDF document text
    • http://htwy.com/upload/file/tisepirobuwadinijifawera.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e686099e2a---degametigu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a5496d36---warubetawinid.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/38358109080.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/47380751667.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210914_111336.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/vesusodatewedasutapa.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/35125108249.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/rivavukolividawegixixil.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/62978904735.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p953klprjkvvltdaf43nu9hut1/watovifozufewanogoxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+pocket+edition+ben+10+modPDF 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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 17728 bytes
SHA-256: 475068f9cb260fb6b7052937489818dbbffee67f535c4b0d0ea3437154ff38f4
font_01_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 10964 bytes
SHA-256: ed8ec5707a861b115ec29893c480b63112d42083bebdc38af117f5473a77c2a7
font_02_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1