Malicious PDF — malware analysis report

Static analysis result for SHA-256 23697d6616067be4…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 05:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03c20b3e1ec33682973e3b54fba94f7b SHA-1: 0849f2768d6c41de8cf344ece2a2dba4551f6367 SHA-256: 23697d6616067be4cd1605e37ef2deed67ff2c11fed6fd5db02d0e687919a13c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9bc5f9924cd298e49d0ef44f5079a1e7/ramipoj.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d0c5283bff28bfe63b6b2b1f331adbab/nasumoxoretorilalol.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tde9ev0mehmre6kh6hk031odit/matevunopufidoguv.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4c804c0b---70316606204.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ab119406ea6218f61888c45ea8db07bd/41699088571.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098636cb9cb0---99183323335.pdf
    • https://hasekei.jp/userfiles/file/74034028144.pdf
    • http://kapelski.pl/userfiles/file/41506102285.pdf
    • http://yasaitogo.com/uploads/files/vatimosemopokukosugewekot.pdf
    • http://kcde.kr/userfiles/file/35134598768.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/5tdq8biavnic1271p0brjclj5u/gozasepenuvovuwom.pdf
    • https://accuratesearch.com/userfiles/file/jeniwigefoluriwiduna.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/21782d21aa3a29ed2bb4e3c9c0342a81/87859403594.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a99a45e9648a295207074b6f3ae094f8/tetilazivufofakudere.pdf
    • http://akinmedikal.com/uploads/file/11951877173.pdf
    • https://daynexweb.com/upload/ckfinder/files/kefumebamigixezalif.pdf
    • http://itfind.ru/uploads/file/17938359524.pdf
    • https://perfecthospitals.org/FCKeditor/file/67825550982.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3da86dfbc---zipadapideludodifezixedi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5a867193---naturudexobetit.pdf
    • https://cardion.dk/gfx/fckimages/file/turidokolivapelanukulav.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c745ea1f---gisovewujus.pdf
    • http://gshosnab.ru/userfiles/file/zuforugiz.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1b420c4f09a67ae290ee0b54d430ba07/wowizabakudidojakuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=spiny+lobster+fishmonger
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb25.bin
4cb56651d4936b52ddde123a2055ffd86e6a14a78a7648cacd3f0ec04cec11c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10972 bytes
font_01_sfnt_off00011436.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 16792 bytes
font_02_sfnt_off00012c48.bin
5eeb83dbfae62fa0e79b65f6e90cd883f1244c159c48ed75e2ced5b7338117e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C48 17584 bytes