Malicious PDF — malware analysis report

Static analysis result for SHA-256 911f3e0005295cf3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 20:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfc8736b681e524cb2bcb472cf78fa56 SHA-1: 44d3024efbea57cb5996db1513d3d4b0f769e40b SHA-256: 911f3e0005295cf3fa42d75ce9d29e42d207d4f9969b24ff03b0ed5c76cf0361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of techniques used to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://taipeitccia.org/CKEdit/upload/files/vudulemugazinidufasen.pdf In PDF document text
    • http://phelieuviethung.vn/upload/files/44516716411.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf9a8200d4---xivaboxugevelibenowajewo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kopixamomata.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160908aca501b9---xalinelutarotek.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/65550800454.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e824757c2b---727131956.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e985f0eb0---wuwesimol.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/17920779474.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609652bf8ce61---16814688291.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/ferufuramexoxofibudubipa.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/79243028740.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/76833327207.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/79863030362.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/43014082524.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/wifaledabiwulatulo.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/tojegalowolegizizizejor.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/68616009611.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/xoxemorifatuwo.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lunixaluvivijotimev.pdfIn PDF document text
    • https://blugarden.eu/file/tudufikokoboma.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/622126b5a4e6d4bb6295cdf9fe60f574/98860621777.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/24291915977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+xchange+viewer+pro+free+serial+numberPDF 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_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 11464 bytes
SHA-256: 7bdcfb4bb95a04cc9e52bf8f348fc4943cf73b8e29fd0ef45463b2f571bcc040
font_01_sfnt_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 16556 bytes
SHA-256: 2e770110dc04198e47534eeb944cda9ca4f1be270426b7df0da54066bd315f77

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