Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aee377d9f12e87…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 23:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c89973cb836fb427552e7760ef823a92 SHA-1: 22b5040a187a1c579f3d5d4c14cf85010189c178 SHA-256: d4aee377d9f12e878ace99155558ecf32cfd8700e227d491faa8ac85668cee5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Multiple heuristics identified the document as a link farm, with many URLs pointing to potentially compromised or disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bm-shower.com/userfiles/files/27493543635.pdf In PDF document text
    • http://220-wm01.netdbhosting.com/file/fotofelidib.pdfIn PDF document text
    • http://mdtrend.hu/files/file/13838001782.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16145bd6bb58fe---watadareporinalubagudug.pdfIn PDF document text
    • http://esen.life/userfiles/file/fepovupame.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/48507550681.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/52984810830.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/89720753027.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/2521640007.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/bubixuziwokoxejaga.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/zavugozotemelu.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/53473912409.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91e900d07---13074095070.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0486a45d7266d8997fafb28ac3805622/zinexodidijubato.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wokiwegawaburefofatenuwu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/31004479687.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/64463264715.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/30504039263.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/35983840886.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/fesekafigiwukox.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329fec1bd45---kibejap.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/86584849032.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1534865c---4323894525.pdfIn PDF document text
    • https://upaspor.com/resimler/files/42748777534.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/momorotukobezamadezatad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=change+open+with+settings+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 10744 bytes
SHA-256: c51c416d7d1b8948fce6746d625faec4359cd935b97ba975eb1bbba5b8173795
font_02_sfnt_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 15456 bytes
SHA-256: 7363a1ab533120b1a2f2d7a3316d067487622d4341459787fb83c2644cf834c5

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