Malicious PDF — malware analysis report

Static analysis result for SHA-256 121ad62cd0fae607…

MALICIOUS

PDF

85.0 KB Created: 2021-07-21 01:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e4456c553f60088cf43f4e68189484bf SHA-1: a58d43a6b021ee7b45034d5e11383cbafea20a2f SHA-256: 121ad62cd0fae60733330f23ffdb36955ecd84576a1549c2a1f1deede9e85f43
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these link farms and the detection results strongly suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b819e645d2---53541264658.pdf In PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/nilapu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071247986dea---15427929814.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6dde35166---77035817526.pdfIn PDF document text
    • http://sooclose.eu/upload/File/pojopatovip.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c7daeb74---kajonezelesopumalegavori.pdfIn PDF document text
    • http://drironcat.com/images/file/demigawofisutotazotof.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/bogunaku.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa528cdd61e---pexuniwimenonivulojen.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4fdaacff---dixizedegizopab.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/451366beb461133500fe0b220f9cc2ad/sodarotenitudaf.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/74618015171.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4ab1b24f9451e1c7d9423909ada73a67/28223726868.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/30144996016.pdfIn PDF document text
    • http://nenorm.com/files/files/10454395246.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f369764bcac5d44d495bba2c23a8c27b/73110013910.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/rikurezubuvojukodi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-11/20210611224536905385.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ff5021c90---17873579518.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/jedabukivesevufijo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7e4c9c9ec30b8cc144ac6784198c3b86/24294534177.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/fefawitijuve.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/dorojefebu.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/10754764180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+sociocultural+theory+of+vygotsky+states+thatPDF 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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 16200 bytes
SHA-256: e278746cf6be48d45f2115aa6e53a4c7b5e486cbd3328517f21811d523617707
font_01_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 10844 bytes
SHA-256: 52ca4319e305c511306f69d3bdb41b6d7d9a56c830bd7093d88b890ce830d7eb
font_02_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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