Malicious PDF — malware analysis report

Static analysis result for SHA-256 421780180c98794a…

MALICIOUS

PDF

85.9 KB Created: 2021-08-25 04:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 49127dc13e8dc9ac3a7e2844708b006c SHA-1: 3c6e56176728994852f469326c58da2c5c2150c9 SHA-256: 421780180c98794a8b4562cd0bcff23d372d0cb7cf50a7e16a6a8a2ba5ca412f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting. The primary function appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=how+many+bottles+of+water+should+i+drink+a+day+for+weight+loss PDF link annotation
    • https://dogathermalhotel.com/resimler/files/xirinokusenidanije.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/zatidijoz.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9199ada028---femilagadubovebe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b66c8d0e.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/49904389602.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/19929596857.pdfIn PDF document text
    • http://bdn10.cz/files/file/kozawejive.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/78076784142.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/tufokabovezaw.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd045a563b---54929191173.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e707edd2c05a640ae90a39757aab0456/70634296714.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/siqri7lfr0iu5i6b6lrgtktcvb/53321288670.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefce2f973---zonaxufumuvosebaper.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f16c1b51c---zomulubixowuva.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca78b26078---vatajurifuko.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19576265f0---99676993178.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/92644973571.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/37412276663.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/bifagiro.pdfIn PDF document text
    • http://camonetinternational.com/files/file/77972231184.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/33880230504.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/55252573858.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ce2hrjso5el7r0800eii8eoj20/57954206263.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_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 11324 bytes
SHA-256: 1572d69f9deae79ad425d44ec92bba9701041c570136a586594f64c5db5b5acb
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 16768 bytes
SHA-256: a4e6dd9c9559d8bb3080208bff31363f4737b4200f29d8e127ff6754ecfd1fcf
font_02_sfnt_off00012f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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