Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa1a132ba056d66…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 13:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50e1c6d97e5ea74666f9067424365b9c SHA-1: 9f3434a571f4c13f65c86adbd9b0b5e5fd8bcd07 SHA-256: efa1a132ba056d6692645655695e9b81fb06fefdebdb291e418076659e76364a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=easiest+android+emulator PDF link annotation
    • https://talenthunt.biz/userfiles/file/wupasaj.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/kusexirenunisojibowogi.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/rizevenopinebi.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/88500376204.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/dalamozaperapadalesisapu.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/xofixerexubuvem.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/10775651973.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0374643001631945452.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109091824064915.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/wijeru.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/57947043043.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/99091368211.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a80b2ed49---rapewuv.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/22188080548.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/12975038240.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/93484200522.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b470ea837a---nazego.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/ruxor.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/17554314980.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/zanuzud.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/zitodamo.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/bumajusasemana.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/71124287440.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea7fe8119---rinasedapunudux.pdfIn PDF document text
    • http://podarox.ru/public/files/godujagutarasevov.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_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 10492 bytes
SHA-256: 125c10ee7d6dcfeb390813d02a320719bc3b07043adbd66f72858b4041e9538e
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 17440 bytes
SHA-256: 227d75899a86b5d5a1e963a16a6617639d6c14d74469f3b5fcc9b0c88f8e0ba4