Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d6f86ea885a412…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 23:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8ef1b9aa4be097639cdff94672d53f0 SHA-1: c72a046490f2f352b56070ae54b51699a77b4c60 SHA-256: 97d6f86ea885a412513473c85214bb53a347d24ec97a52ef5eea4f24c5e16700
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or serving a secondary payload. No scripts were extracted, but the structure and URL analysis point to a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b738da8ba55---ruzobuwifebejirenuniwir.pdf In PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/71398101174.pdfIn PDF document text
    • http://learningkey.org/userfiles/puwowafisulipomon.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0150506a3c---potuzoxevirutavuzodifam.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a1cc095c3cf6bf8633af57ba421966e7/gojuwalejanefibutawirura.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tgu6uuq2kqo91sj4ngb5sat1ok/fuviturobekiki.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/morud.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8d3afa52f11195856989115af6c69ae/89120368382.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/595883ba625cac352126492721e40be2/21497200865.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/gizakilitesiforirozo.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1010d1cd09---kitevozin.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/46577319048.pdfIn PDF document text
    • http://anpo.vn/upload/files/81540268706.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8aaa8bbe518c8410322b520c2cc633f6/sopabufiwani.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160965d7b4fb79---kuravaruranekununonarimo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07d5125d4---mabobomufapenugonaxej.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qb0d6jvrogfa571v28kvppmb8i/16008400066.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060521115373499.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/bakofagakagebuk.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7bbe6559bcbb92acedafde893a496aee/41875940667.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070bed443548---dimebenaguxigivanarow.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/17164094841.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/18155539223.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ko1ngsm45bnl3ef54dg5fg056p/57688155091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=do+you+havePDF 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_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 16984 bytes
SHA-256: c5c3c07b4faa9e3c206a50152a027fe2cfbf46d4c4a9099def807f206bf68d26
font_02_sfnt_off00013afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFE 9880 bytes
SHA-256: 2fe5abaf54a300ef260917f921ebdd2513e76e4d818f899a410bc55cbabaf5b6

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