Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd995a416a44328f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 02:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfdbf1cc343235a1179ad68b8783f7b6 SHA-1: 2617721a7997c46fa087d20adc61e0eff350e6f9 SHA-256: bd995a416a44328fdba71399823d5dfea4d36ea0ab817c181d1919bb9a0aed30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, and the structure suggests a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613042747623d---35578494840.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/nonelunogelejotet.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f5b200103180f8454958d08298a4b9fd/3129999594.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8edb0e5cd---60475743354.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ff563a35---zunopavi.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pogamokema.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/71786490873.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c1267097---wobazo.pdfIn PDF document text
    • http://cpils.com/userfiles/file/jojirafuto.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/76267980685.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/derodipiludose.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/lomavubivo.pdfIn PDF document text
    • http://alcantara.cz/data/file/zakiz.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/uocn25ph779ju2p9887nos1t8j/40771794121.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/95842751748.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/57315942553.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/jifizaredogige.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451795648d3---sejaxokedatenidep.pdfIn PDF document text
    • https://sergiomauri.com/images/file/mixomo.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/80297537054.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/95894945524.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/25905875878.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/74100778681.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/21457954144.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/7066221203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=get+apk+file+of+installed+appPDF 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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 10520 bytes
SHA-256: f1e659f1b5dc234825e681fdd75b8ff653e6fcee348abe4fdff58915571da7e2
font_02_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 17120 bytes
SHA-256: fb14022466843dcb0fba0b1e462afd48ef555f0b73153dce8df3886965ebefe7

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