Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffee0deef63bf66…

MALICIOUS

PDF

70.1 KB Created: 2021-09-04 17:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ecb2a63ec7492a380474770edc5ecb6 SHA-1: 95e9a58ff9ae05123359c1e105959973d794e767 SHA-256: 0ffee0deef63bf6615457b9d3fd8d0942c9f8ba51d19088929f6d8af236a6ab0
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.anapharmata.hu/ckfinder/core/connector/php/files/puxugufodekisalugixunutu.pdf In PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160964f81b0abe---12509055717.pdfIn PDF document text
    • http://pinxedien.net/upload/files/9022856904.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/95755941187.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/bufimolu.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/30519323300.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/47853775009.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963faf7a5c4---84397267597.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/fevevumawoweramuxu.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/49728509670.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/riwewevovosiluxoxaviseba.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63efacc37e815ca5338477f895c72d16/68802887290.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/956ec5b9005e955f7efcca3cdae3fe97/vobusekinasosaj.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/remogesi.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/litixuxatujol.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210708_D97E58BF37A115A2.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/romomofesanusabategokaxaz.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/fusorabumi.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109020004417047.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7986d692dec0392d9bfc00d901cda226/sowaxosiz.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc44ceb66---556431255.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/sinozizokela.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/1hp37g8q87dliqtshof97iovd0/10904921558.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/bazuwabidujeruwixuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ingenieria+financiera+y+fiscal+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_off0000b3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D1 10644 bytes
SHA-256: a4980a91365f21a1200443173c23ef91996cfdb8d66183df634a6874a3e2b2ed
font_01_sfnt_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 15420 bytes
SHA-256: e43c3bcd7694b6bd76e5137253610fcd2f250676965374b64cbbfed8e7803eb8
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1