Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd40f118e05252b6…

MALICIOUS

PDF

155.1 KB Created: 2021-07-07 21:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff8e0e9f372b8c58f50003091650580b SHA-1: 1ef55056f014b1bac940dbee14123d09dee7be9c SHA-256: dd40f118e05252b62983538e321d1333f911ab211b51feee9f00c36eb0ff7f9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. Although no scripts were directly extracted, the nature of the link farm and the detection indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6827bdf2b3ad98adef4a039b14545dc3/nabuwositifapedodarirami.pdf In PDF document text
    • https://walkandsmile.com/userfiles/file/8770067293.pdfIn PDF document text
    • https://kristinanamaste.eu/files/wipazomoraputi.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/395d87fad1cf6813151799c0f7ae624d/rinipowoludaxizafipumax.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160df7ad20658d---25120888064.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/63c77639c6adb188838a3bbf45caea13/semaxoja.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/40898602906.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/96422728585.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/gupalir.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/voritusonididosorufe.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160df4cb69e3b3---95914116238.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/getenesatafidule.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160997c15121c4---305717537.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/tfut2fj7t4oda0mga6n6evo4bg/64456622649.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f7ce2da756ffd69a910ca0efbcee9af6/mafevabekatimo.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/88530675379.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160e4984ab5907---21853277371.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/64635625249.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/obfgf485nhvafscfgqvh7ejnbi/22865747449.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/57754221253.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/71b02d80645ec76faae5b86e2bc40508/pidiwivojip.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/bojov.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/volobowakotawowukulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=taboo+pinoy+sex+storyPDF 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_off00020109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20109 17236 bytes
SHA-256: e53c7a36469fec3b374ac833fd9aaa1c3f20840a1f5ed671e4d2b3f060750e60
font_01_sfnt_off00022d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002456f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2456F 10516 bytes
SHA-256: ff94ee52996f7c4380e13ad0f973ced0261f286ed04b7ce12a4033789ed264dc

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