Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef98b9d846634ba0…

MALICIOUS

PDF

100.3 KB Created: 2021-07-29 16:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 890c3453eff2040770ab9dc53a7d7e71 SHA-1: 84c5158abcffa56cc8bc00b50c8a017112c5d86c SHA-256: ef98b9d846634ba0d5a82f7358acf444dc9580a92befecf1d4a682bef77d764b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: 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, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest an attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://wills.sg/wp-content/plugins/super-forms/uploads/php/files/1186232a9dd47e0bc8ebcdc76f3a7eae/modizonuwosoferomiwasi.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa71bcc4e8---89755538000.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/74354909344.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b716df176---70325480261.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607438a35eba1---lovatanudu.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/zosepejanixepaf.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c5ac4898---9216297814.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/27953735791.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n89lchq2g5ujbpvfta55ifujft/648110490.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/dafaragudokewok.pdfIn PDF document text
    • http://drironcat.com/images/file/69646139868.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a35389da53---61021161975.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/fowuvuzuras.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/43709078643.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/munotozisoninon.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/57966e409e36a853a64807d5a2aa9e19/gurusiwamepov.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860cf0b88cd---rodibitetuwuzivuji.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/28387b527d776131a673d2a3f6f150a6/fizeminomepapinimoda.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/18168153590.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/ganafegaj.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e455c00c---14206341496.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6e5f907c468fc6e28b6ddc4e9a79845e/44877198768.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e5ab4e60---lijuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=is+lg+g7+thinq+a+good+phonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 10716 bytes
SHA-256: 6343fa5839e9e6bb84d4568c6dc9db6ba38acd60a58fdb7f25e4bc0f36b1a73f
font_01_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 18084 bytes
SHA-256: 954be6bca2b2344990bd6868de9f46a7417e53cdc30cff0b26096e7578245e63
font_02_sfnt_off0001537b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537B 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off000168c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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