Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4f878fd560c302…

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 19:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d45ed519b1eca065ea274feb035d519 SHA-1: daa0dab29536623cc8fb213321e8fd5cdaa23096 SHA-256: df4f878fd560c302d110206e44c10aee125183ddefb7aa99a0f7bae0bed23834
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=fresco+from+the+villa+of+mysteries+meaning PDF link annotation
    • http://badgerhillfarm.uk/wutiwi.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/69834549004.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1f9bdb1899be729888225b09b8e5914c/kinude.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4a2f5f6ea4d07cb6b2d32f7b37450455/9866338240.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/84355526620.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/jowejogexuto.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/84218393632.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/sepojataler.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614562ea83a70---84717019263.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/88201998210.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/31043211185.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/57658643158.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/finokanuleparelanipuli.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614809fd290fe---remumodixasawale.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ulfthnc24o8lrueo3a3is60l23/837420644.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/18799377270.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/2882091680.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/wavabiwevumufarepuletox.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/lesovapuvonuzoxugun.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/66457812057.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/81312807879.pdfIn PDF document text
    • 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_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 10940 bytes
SHA-256: 935032b6e66fdce34d2d9593bd83ef2f54e77121b6740378c4dcddc8cf7b7b32
font_01_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 16912 bytes
SHA-256: a99ec812acaead1e262a81c12e2c38e1c18b1054e587a129d6ed9533652c70f9
font_02_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1