Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f837fa6e571eeb…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 10:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 18e86c3377d66761fb68dac019e6f549 SHA-1: 4ff690684e4ef00da73d17cb4dbf7117e505ac3d SHA-256: d2f837fa6e571eebd76c90df4e21f9fbb5d8e21a28ca5e62d88e6fc32d3930bb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking a link, likely to download a second-stage payload. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a campaign distributing malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://globaltranslation.com/demo/global_translation/beta/userfiles/files/turebon.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ecc1cfe6c---bigamibivowuwid.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3ca1a3389feb91ad7c52484a5691429e/xijokaniwilek.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/fuworawidunisigex.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1fff2fc0a1fff11200cd8f0e3c5f6861/18404816741.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/40476168252.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/jodomibapiwo.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/66252727272.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210619192849_vbw3fb.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc8a72114---kojizodimibabelosebagi.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/410693294.pdfIn PDF document text
    • http://health-bridge.in/upload/file/35012555609.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/56153150050.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee10a37894---labagukabatudujiwux.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/45ae754fa44a2cffeafeaf57351ef3a7/mojinezesibebuloju.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2s6s37d7f13guo8889somp3l83/91081041634.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/10997986737.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wewavideb.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/pajeparuvutaruwapozodorel.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/74871303585.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/ropebufosilotaf.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/jedudederukusok.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/doxodobukikubexufizi.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/vemuxutawuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=was+were+picturesPDF 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_off0000badf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 13748 bytes
SHA-256: f10b04d7c2c9749591adc8a0fcca0bde3b9eb8e5fc2011ed9a963a7ac747e4ed
font_02_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 10276 bytes
SHA-256: dc5bdc87ea6d88834cf9c06e1aaf47ae8b11210eff852657cc68cb695ab424ec