Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9731eebb3f5b0f…

MALICIOUS

PDF

83.5 KB Created: 2021-08-08 14:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 374cd70fd64d2a1cfde967be2ef7ecf2 SHA-1: 6906fa1732ac39057b8d91ab3a00141219fd6b75 SHA-256: fa9731eebb3f5b0faebd9a5e11fe3996bf10cef1eb702afc01c574decc6afcd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, presenting numerous URLs that lead to external content, with several hosted on compromised CMS upload directories. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://projecthouse.bg/uploads/CKfinder/files/fanufuxiwojujukapozo.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/867919a75be8c2aee094582d5af49f4f/zolikijazotibibawapol.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/95934479771.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/77547754095.pdfIn PDF document text
    • https://bliznacite.com/files/waxosopifabojovoguwipema.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/fuwumodugomemum.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ff76b7183d5---tesokuwopifonanov.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3de3f207---65517733896.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2f10e7ad---mijiraliposijefudufasuw.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad463e3846e---mexalawexerozeribojeli.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609149072ad33---27192938033.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/aaor29ecjujvgvg6lh2nnao3g0/jesifozonijafamufubiwure.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/39230424538.pdfIn PDF document text
    • https://aneri12.cz/res/file/72983747987.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2930a61640---pegividavotanezubujibote.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/fa91e451e153b8894fb06e5aee117162/28713950568.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/67562068854.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5baf27cf20---maziwotavuviniwafamid.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/87509767533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kpss+vatanda%C5%9Fl%C4%B1k+konu+anlat%C4%B1m%C4%B1+indirPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/412696e9b448237fcc1859df1b31f419/54410874129.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_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 10956 bytes
SHA-256: af387953df0c2025f4a246c028607700c5e6ac83e4047e77e8763ffbc6f7467d
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 18584 bytes
SHA-256: c0ac8e22f59748f74a994e7b04abe64411389f168294951394fed7afd3c40b0a
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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