Malicious PDF — malware analysis report

Static analysis result for SHA-256 925987cc7b7d59c1…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 23:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9761d2763bd8ebd839cee4a08bf91515 SHA-1: 072d490451b18963a7fa46ce0e3bcd3a2bc5291a SHA-256: 925987cc7b7d59c19f8040d2eff234b77cf12dd4f8f71b01031bcc0cca6484c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, designed to trick users into downloading further malicious content. The presence of embedded JavaScript, though not directly executable in this context, suggests an attempt to exploit PDF vulnerabilities or facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thanhtindesign.vn/uploads/image/files/96824123749.pdf In PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608941d30dc0a---muguvedo.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/lonuredeliferibipugunur.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e379513aac1---32944253688.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b7ab8d495c1c2dd51d102e5244ff4315/kolutuxe.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/82021613977.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/nosepovawut.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd0f8fd58---kutelexoromimakikuvivuvub.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/36818164310.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a323c85390---moxepuramomeruxilo.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/pumenajalut.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/97cee91f2171866b082a29346541099e/51119885738.pdfIn PDF document text
    • https://isleo.com/i_photos/file/nepuziliwar.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/71093784735.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/revosexovuvon.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b539b456a3---87447928298.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/91563719040.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6dbc3f75---jizon.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hcig4udad9f7ao3468sgrcqbio/diregisikij.pdfIn PDF document text
    • http://bronia.org/userfiles/file/47611002296.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5b53fd006bcaff9a48fcb7776d6f475e/91352007813.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/bd466g4rcmcd9rhmptqhde7ea3/21620324849.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f9e8b0aa---65987969294.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/toturoliwexujenavawujeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+do+livro+o+vendedor+de+sonhos+em+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_off0000c7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FD 20228 bytes
SHA-256: 35c3556015a4f144880590ed7ab43d57235e1836b36e04b03de924d5812e1ac1
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 10820 bytes
SHA-256: 614a25a42aa605fe3d2396d6e0cfc84148869ca7970034024f3f9cf428d0cfc1

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