Malicious PDF — malware analysis report

Static analysis result for SHA-256 016fa95cc82ee1dd…

MALICIOUS

PDF

114.3 KB Created: 2021-06-30 23:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 78fc39e03d1efddf3bcb8950dc89e4f2 SHA-1: de5a6d7b0da7579a0a912cad83be59293b7ba1cd SHA-256: 016fa95cc82ee1dda73ade8312cb65e5b7f231c890a46801a154225e127d977a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and numerous external links support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://hoangminhceramics.com/app/webroot/uploads/files/koxeb.pdf In PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/92969293193.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ieiadvv1hgp1rgighd65gs8eu5/wiwive.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/vofuruketegibus.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7753ee6c---jiwubefuguk.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210530084629_399625592.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/te0ptous27pdidvn95gg810r0f/weputimuxutoxemubezer.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/30869501478.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b49dbf07---58693545969.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071b86eb7e25---83915460440.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1df556997d96546ab6dfe996e82927f1/31661992079.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442da1f698---60358367734.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/22339a089b25b4015a2c2ffae466e7b8/82884505488.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/60106504290.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c999fcb2---zibofobumobup.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gagufa.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sumijelogawowegig.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9e4d4a70cd482a3411758f79fa8cba11/23311468077.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/960a0de6505efb3fac64e3dcab995b50/22977251517.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/gizugunotavesefamoxokide.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210530_020115.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d514f16c37accf8e07e5c42f99daf5bd/39417976554.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e16e170f04b06c241b57f088253594b2/50869719324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=types+of+patriarchyPDF 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_off00015fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA9 17060 bytes
SHA-256: c905de428886f82911d9ea7cafb3e7a33dfbacf70f97cae8e920548f462fc432
font_01_sfnt_off00018c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C0B 10504 bytes
SHA-256: 4f5226a36f64adc9b357efa32b9bac656f875f96b99c4b858b908a283711f082
font_02_sfnt_off0001a42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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