Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc48820c54cd7d1b…

MALICIOUS

PDF

78.0 KB Created: 2021-08-21 05:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 42eb48f9860c36a8b0a8d0163926d54b SHA-1: 9f9290ee00d00de4a1ad2e5e780be4ae940aaed1 SHA-256: cc48820c54cd7d1b56f59b9326113e79344e27172bf05d1e101a44a529df38c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites. These sites, in turn, host further PDF files, suggesting a multi-stage redirection or download process. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070333e2081e---kitekofivafamatar.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/297e3801a7d93897a7178c8be659ddcc/13513200192.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73fa440d9---zegaj.pdfIn PDF document text
    • https://papiratisk.cz/soubory/13460785611.pdfIn PDF document text
    • https://akemi.ro/hirek/file/37722756404.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ba7722e3f1d37dfe11ed8b058f8b22f5/64665675660.pdfIn PDF document text
    • http://jarosi.hu/files/file/600135562.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/p54kk3k4eo4i3398dtfr9o821n/56272131812.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9hadjccno05k1hfidufjb9mlt2/39547015994.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/fepiluvugiba.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16106a9ea4d6f6---58702616052.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/23489364902.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a769c8a14fe---gedopelef.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/lakitapagatogu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/72fe24eab79e2938fab7a2b6abf07cce/rusafonesedike.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/totofufawebubuxezasok.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/1epcu3e9o9oflqtkvcjqlikf53/sokunil.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/cciarg4ghuhcj3k71hg5tgovnn/vonixojulopop.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-23/20210723041237190707.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pivmkh7ku6nalshef0ov6p1i1r/talelomotuz.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/felazi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280506048742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=blank+music+sheet+pdf+a4PDF 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_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 10988 bytes
SHA-256: 890967a6ac31945d002a4e195fbbbfb169bd2cc6c8410fee5a9d9b0c9b77815a
font_01_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16516 bytes
SHA-256: 895cc02376602f8a39ed7a0ef92338de9806c24fd738104a4a6e3b246565619b

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