Malicious PDF — malware analysis report

Static analysis result for SHA-256 8225d110e6f1cd5a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 02:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17d35b52a5a3cb6cde8dd2167932b3a1 SHA-1: c69b2d7a5dfa02a4ed4b6330ea9f3ba1a53ebc1a SHA-256: 8225d110e6f1cd5a01abd519b1ddfeda927fa0960c0e42a23eb10b697d26690a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various PDF files hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides a password to decrypt a separate malicious archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee5f127e6---9808094947.pdf In PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/vetivomonivuwuresog.pdfIn PDF document text
    • http://charontrade.hu/data/file/gimemumewavejivozexala.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/vewetogananuraw.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddf2e819b---67843417255.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/nirubepotavafevifoxi.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/tasosax.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/sepukutulebomazozezos.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df111458896---52374061815.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/pegawowebevekabixemazo.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/82a1cfd8e8cef677d49fb478226647a1/bulolozagomijava.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611584a7c7e18---pezimefirawuwokirejituda.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/garanifisuveva.pdfIn PDF document text
    • https://shidoremicrosys.com/media/859146419.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f3c2c96061291e372403e86a321a00dd/litipego.pdfIn PDF document text
    • http://geotersrl.it/file/bivovenifidisokuv.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/rikarefimaxakisewo.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/75063ffb1555550f497dc317fa013a09/21510902135.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/26732938302.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0762ea42e7---dupomobulepugazovagasuli.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/62d8035ea7d0e138e6e1b138f2cd0a61/kevew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=linkers+of+contrast+worksheets+pdfPDF 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_off0000d143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 10808 bytes
SHA-256: 13fcf0c579857c4ed585be5810186c9c828fd454dbe7601e90fd9712d5b79efa
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 17184 bytes
SHA-256: a08713fe6c824556942a1d8ae6aacf8e9125775512de738003cd7eb3806ef8c2

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