Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d8d41c5fef1f18…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 13:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67ada7a8e04281fff390537ee35a207c SHA-1: 34847322798da5c601803d3800f8d0d56d01c901 SHA-256: b1d8d41c5fef1f1898df72905430b27b9a304929bedd7fcbd1ade51825ca7757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to multiple external URLs, some hosted on compromised CMS platforms and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399736c11e3---bitenamova.pdf In PDF document text
    • http://abpjse.news-read.com/upload/files/sezesadiva.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/zojanemosimubo.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/73415e2c7c2e05219c12141896c001a9/zafitoledigokawurug.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/49139235234.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/35694766572.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/2560416021.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_06_08_00_31_7894.pdfIn PDF document text
    • http://taigesw.com/upload/files/39283201204.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/kowokagujokagasadol.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/965346c67ab896e7fae50faa0831476e/73987453365.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/lisiterefiposaz.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613073b3098fc---narixobedulanaroromizusa.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/japelopesegumodunetu.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/48125952922.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/doradarupam.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/rarijivenaga.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/tiraloz.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/joxetodasoni.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/rinazobix.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/62437669747.pdfIn PDF document text
    • http://anpharma.net/upload/files/88897743446.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/15843646239.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/xalufarorujaxupaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+find+vertex+from+quadratic+equationPDF 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_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 19236 bytes
SHA-256: 064df7a6065140f1658107a7e6144044e8f9a630b214160c7f5c1504f10d2fc1
font_01_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 10912 bytes
SHA-256: ab48f6e4e311882e12356dfbd626e874817d5496a1e4b1f7685f4d45ce6a3020

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