Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de7c74f5ffd3a39…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 20:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8822b71ab1b0b07d29d04a7f75785f8 SHA-1: fb9f37eb6fbafa898ef36a7388b427b5cdfa2ee0 SHA-256: 9de7c74f5ffd3a39833294cb24dcc4f4c654f86a005c18c269b304af62d7c242
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://1hozain.ru/files/userfiles/files/begoziwukefaxemow.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f6b17d2c8---40188975039.pdfIn PDF document text
    • http://vhktn.at/images/content/files/46675451444.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ef7175a1113f2908ba5ff0f19271ddcd/68470724446.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/23724069567.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/16076725167.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/92083c7ff48985c3175cf6007b312e7d/zadusakofedidixatotabo.pdfIn PDF document text
    • http://santeh.md/img/files/ruloguwo.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/97563006221.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ef6d10be7f3116ae5e83a74391f0218c/kolejopeto.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/gonaxim.pdfIn PDF document text
    • https://congchung7.com/upload/file/poxibanepafumiso.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/xusekurilatozezox.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/fupozisope.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a90f1aa5---22322091960.pdfIn PDF document text
    • https://norservis.info/files/files/felokorugizalebim.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/04b9a8c32e44ab068765c3e24da90e87/78186512974.pdfIn PDF document text
    • http://chongros.com/userData/board/file/dinefadasikud.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/38824345561.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ucv2ivfjottq134jpa4gj33867/26046505047.pdfIn PDF document text
    • https://rosycaffe.com/file/16109921199.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a714c74fc---fitavenoj.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/gixegevifopemebebuf.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb889642bd---fikuxi.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8dfc59bd2fcaac82239a29af4ed2e5d3/gukigenezilasikol.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/kenavowafuvapat.pdfPDF link annotation
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=addition+and+subtraction+worksheets+for+3rd+gradePDF 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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 11280 bytes
SHA-256: 3e6ccdbd751829eed16a781d617fb93c16c1ad151d1a5e20048a0c02097d9bf4
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 18100 bytes
SHA-256: efae11a60ff44b3715204aea0f261ce49032e2a25cefbd2079ac3e3cce8b977d