Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb30f4b4cb3ead8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 22:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e17391b3a52257e69289a390ba507afa SHA-1: ebcbea91bf7105d94274e3d064eccbfbf7d4a6d1 SHA-256: 1cb30f4b4cb3ead8a5e8db5d6c680c602916d036f1ed9881deccaae6950ed651
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious 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://infiniteprospects.com/FCKeditor/file/ridoluse.pdf In PDF document text
    • https://jahanchart.ir/data/files/file/nosivikerulugapirezagade.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/dedodegojorawumu.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/pivaxafoxefamibi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2035957606---mutunevakavovelabodogopu.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/zoxumelesabaf.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/wemudub.pdfIn PDF document text
    • http://medi-sen.com/files/files/7328578135.pdfIn PDF document text
    • http://emeat.ru/var/files/36364296841.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7466123af3daae3f6193da13b3772954/jozepugosofidowozam.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/57924295548.pdfIn PDF document text
    • https://alohasafaris.com/files/81026845109.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/e525a31d611023ca14bd3da88720a6e5/kakogatakapubi.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/11649313761.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/fapiro.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a38c3d8a---wuxedidepagajufinabusiw.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/4631388734.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eff5f11ca---42582471713.pdfPDF link annotation
    • http://robalton.es/Albums/images/file///pirima.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097dfba4cb2c---99466107011.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/1717097c335ab11cf2e5c3b5184faf7d/54475425578.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/75822236321.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/96675739395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kia+stinger+manual+2019PDF 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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 18304 bytes
SHA-256: cd2f2bbe2ddba2eac8ca08744c838f7507ccdb8103a6d5e87e4593ae375a1d56
font_01_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 10884 bytes
SHA-256: fd1888b0236c16ab85ea6ae129bf403e316977300c7165cc861c0ff1ce264246
font_02_sfnt_off00012611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1