Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec8507858ae1594…

MALICIOUS

PDF

69.1 KB Created: 2021-09-03 18:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97408bf52512a209b84dbf29f74c4819 SHA-1: 4fc8de4b64953f3c7354afb1a03f951241c43335 SHA-256: fec8507858ae1594cf3ee91b8d273e2381265af2ebaddcf1bd6ac15bc29561c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • 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
  • 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.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/71m57it086pveojos27b7223hc/rexukojozifun.pdf In PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/eb19c24bf2f90e11088bb44453b1f409/80397230074.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/gunakinigafejibebawezudi.pdfIn PDF document text
    • http://scro.ru/pic/file/94866803998.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/23404155085.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/79828214280.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/85b3c99f1ec351fac7b41f8d3aff646b/zagapetadaderinil.pdfIn PDF document text
    • http://sgpeo.pl/users//file/kubajanibomedunizo.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/70932394161.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9mmthridu9rsg8elaejd63sbco/22419233377.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/0a7bd7e89cf675dd926b8789bbae221f/wenemikaze.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/50272853174.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917f2ca5446---xugezakorer.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/12292435515.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/59016020812.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/36351949056.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f22a438ccb0---733022232.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5b429258---57475904554.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24d34e72f---30223831695.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/98908200133.pdfIn PDF document text
    • https://x-software.cz/data/file/zanedofujemirozaza.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/zaxorog.pdfIn PDF document text
    • https://mavibusiness.it/file/33475962229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=formal+and+informal+language+worksheets+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 17988 bytes
SHA-256: ca6860182060133d898e6f2c2d8931e277e873542b219d5e0685c9cc4573a1cb

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