Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74799b79b6a619a…

MALICIOUS

PDF

74.8 KB Created: 2021-10-05 13:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 226b60aafc89e9bf0e76726c57456f7e SHA-1: 7fed9ddba4a8e49d7a0b2766f1dc71a9565de2d1 SHA-256: e74799b79b6a619ab969d5fd51ecc7d9c55f4dc27f04e4bbe6aeac19061f50f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The primary function seems to be directing users to external sites, which is a common tactic for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sahcarpets.com/userfiles/file/69715419400.pdf In PDF document text
    • http://megat.pl/uploaded/fck_files/file/66074308571.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/74128203274.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eedb80381c---99929514240.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143465d58223---24770882704.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/92151143993.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e8a3ad71b7d0432f1fe1a113f634f58c/88209922062.pdfIn PDF document text
    • http://sbcnepal.com/images/file/tenize.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b94408c8bd---wajirovonubukosifaxamag.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0884264ab4ed311838122889866a989e/23665700044.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161564c8ea4d70---tavofedegizopigizi.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/bevomikelesobodabobibatem.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/pasibujugejawilusinitos.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/62327986801.pdfIn PDF document text
    • https://tl-systems.hu/files/files/kisesitenepesibig.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/78357732348.pdfIn PDF document text
    • http://uchid.com/uploads/file/29532433046.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/65487177540.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/69016839037.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b9a0a94b8---72479702760.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/wosufosomarulon.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/depiworirubanoxugodinuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=input+tax+and+output+tax+accountingPDF 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_off0000c335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 16772 bytes
SHA-256: 687af1c8ff2979ce3053bbaa9f4050564ffdcf4a93bbbd93b62f2bf557bcd755
font_02_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 10396 bytes
SHA-256: a9e1ad62bd00fec8351c89a5bc89b11f4b85f38b1851725ee02549b4067991d1

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