Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1191e826fa2a1c3…

MALICIOUS

PDF

90.9 KB Created: 2021-08-09 21:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad79c72b46f549f2d9739b6bbbe3f656 SHA-1: 4455513ce461864b2b7cb5d1f2069fa25c3801c9 SHA-256: c1191e826fa2a1c315e1fb007b9b263b07f25e9336aeb3d274ec1cd7e94a94ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL patterns and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/06f5525c3d82e7c31773c98fe85287cf/rurajisasunedozitewanevol.pdf In PDF document text
    • http://interstyle.org/content/xuploadimages/file/bijokev.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/79424105485.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4ce74795d8d9315ad347fa1b2f99b953/47705434396.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/44618285738.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/82705139890.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746df151cb2---40838850850.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c446f52618a---begaxa.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97315065ca---99566934655.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb3d157dc---52248622315.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/sumezap.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/39848058427.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/231618666.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/lijaza.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/folugarefexamexewujanad.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/sumaka.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/7106221752.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0srab8pumceq14v8qq237u1gku/xoboxap.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fbacea283---kufolujilasasatet.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/2598053669.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/tasax.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/cf8d03e2ab937d18ef1df88a95c89518/beliruvajubawexojidug.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/46714457613.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8bbe41a7593d6d6e16a4bed418d57cb5/mirirunodabuluxenibas.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/momewakitif.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9d674544a2038bfe18b144225e5a9d96/giwiradufewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=microsoft+excel+basic+training+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_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 17012 bytes
SHA-256: 1b61f7652e51b680c26b0a95de4aa17b10eff52add352702966e099d3fde6a1b
font_02_sfnt_off00014148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14148 11028 bytes
SHA-256: cb3f79759765973180f82b0b01a5dbdfdc21ae5b64fa73f006532a851bbb1bee

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