Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e992a338c7acd7…

MALICIOUS

PDF

84.8 KB Created: 2021-08-20 03:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2a61e3cdb7b1efdc1a160a8edea1105 SHA-1: d22aa12d8d66781cd1524553aa551b1cfb628b2f SHA-256: 90e992a338c7acd786a37782cf8e8bd766589ed17e4fbcaa4c6551f29cabb76a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are identified as compromised WordPress upload directories or potentially disposable hosting. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://shopabrang.com/images/files/nisagawulepu.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0445c2ceeb---23808335041.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/fuwepakoz.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/86652923477.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/numulisuvijikimaxo.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/77972384071.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091c59d55e9e---kapibevesipagudidevufa.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84f2aada7---pavur.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/sifavunomebubudo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be093513cb---34748928877.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5a478aff---lirudibukuxibapatavan.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/zivaxidewafozaxogilitug.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/37548538060.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/31663052389.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ad019642abd9b727d838256e67845ec8/74214831233.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/genepebupatiwamobo.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/72551672222.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160981e32d0304---76187333776.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/17495008094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=1+o+que+%C3%A9+arte+para+voc%C3%AAPDF 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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 20380 bytes
SHA-256: bdbd3a31e89876f5dcbfd7e96a7a6d5bfdf06d604eac68557a1864c6c082c370
font_01_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 10536 bytes
SHA-256: e9065796236673eb4f64b3b347b1723a9728f7044c0bdaf77941760cc6bc8424
font_02_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1