Malicious PDF — malware analysis report

Static analysis result for SHA-256 284656fc9a1e1250…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 18:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93b151593acaaac1457bed5e65c0ba76 SHA-1: 0fe00b3d6cb241f70c788bb7242a259ca31ec7d5 SHA-256: 284656fc9a1e12502f6354076e49252300ae07b957e73c9aa7683ac6cec0edad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristic firings point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=download+shadow+of+death+dark+knight PDF link annotation
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/42f9ade62de67f94a7d119956483bf25/xexipitum.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/bekalunufunoxibajuxene.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/dupixigip.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/55958013477.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/zoxenaxuzagimubagasijima.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/99853744237.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/28704066133.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/69923574903.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/30495323525.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/togelumiziv.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/jorevolelof.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rnc2e1v0gng2bu2q5lop141sbs/xazijefawofokugi.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/99880865589.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109061132361110.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/80737070430.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f28c6dc09---mudeketeruxa.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/82448654471.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/47311865887.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/kikanawu.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/rotixigasefirepopap.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/xewoduwet.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/47772205584.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/gezemanapakujuvapafodaw.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/82727241200.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/64248585763.pdfIn PDF document text
    • 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_off0000bbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 10812 bytes
SHA-256: 68245d163d1e35e77d598c3c9115414900c3af43bd9bbcf8b7f86f8d07bb9e49
font_02_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 17128 bytes
SHA-256: 3c0ec9a6c0dc2491854149b53f57fdeab6d41fc01055d6c9d9a4d71817e32d3f

Open this report in the interactive analyzer, or submit your own file for analysis.