Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a2dbd2ee867a40…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 06:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 417ad30e9910e43a8945c73f9fab343f SHA-1: 66fb2a6598310563cb1602094ad937669dc4645e SHA-256: c2a2dbd2ee867a4041d756f968718d0473819c03a53ed28265e0a82ccf042163
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://goooinggroup.com/userfiles/files/20210810_060316.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a76ea7eaf0d---paperirafebeworobujuvari.pdfPDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985a8c3f2b4---70028836737.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/juzojivopukizab.pdfIn PDF document text
    • http://funperm.ru/content/file/74376604581.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/9ub0r30c3ng4ohbnqpo1n81fmg/78552717985.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/98633766991.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/zabelupezabasoj.pdfIn PDF document text
    • https://fasaac.org/temp/files/ripigefamep.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/95231815509.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vrjo5od53787avqp562541f2c3/tipuwu.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/buzufixum.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/91850753425.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ml3ddtg2nfsecibpqdtk0n00qr/10341821139.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/85812834635.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/93342025333.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/rufojasubisime.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/21434614811.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/17889865094.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/vosutoze.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/50734761733.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/luvixabuxis.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/29527805166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=elastic+and+inelastic+productsPDF 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 19812 bytes
SHA-256: 8c3ca91dec8cd12ffbc731d7a770f5e86ecf43d477409183d8da3e07d694778c
font_01_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001273e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273E 10592 bytes
SHA-256: e9828dc85da2a9203f5e3dfb17aa56b28e9d4fa00f30bba0c69882ed80633d9c