Malicious PDF — malware analysis report

Static analysis result for SHA-256 744cf114684dd65c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 11:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5870c811d41c1adf09d7431a6ad39245 SHA-1: f1602557713c0c7a4140c643b8969a7bf83df67e SHA-256: 744cf114684dd65c13367f8fa35ff7dba325e1b99a94ffaaf04582b2533729d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=worksheet.cells+text+format PDF link annotation
    • http://adria-ex.com/images/blog//file/55305026369.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/4746409487.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e8c483584---nuzobixamoxufez.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/zofefagov.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/27294732886.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/041a0c78a92ef425aeadbd6cbed308c5/jizobifafivuwa.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/zufubafez.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/79524541042.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/161194f4cc6cc1---nivuwunoxax.pdfIn PDF document text
    • http://zimmerei-possert.at/sasosidametop.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/23120690927.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/abe0e6c409b4ec962af23e9bc9295982/dowetatuluzobozakibe.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab649f02a5c052ab2a00f02605451341/mawol.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43d7e8b2f---widadakefonuviwawe.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/49925122186.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9ab57e87d32ec5455d1bcde3339486ff/duvakatolul.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4ffa7285022f45a412942943dcc50296/nedozuzoxofafiwelusetoso.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd210d109c---koteribiwikuf.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/adbeb424b66a5b1fcc266b10f43e9271/86983704472.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/mawiwisowogi.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/xepejenetuzat.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/33521202107.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/51021362974.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/wobelivigiwirepelusiju.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/40679f546e7c92fe16809ed0fa81a700/64538585302.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_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 18308 bytes
SHA-256: d1808053df8bbccb46b54a289b83f50ebb6d6a4765860cd9b1c019ca7510c37e
font_01_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 10656 bytes
SHA-256: d3746e7d46705a886e93528ee50a55cb5fdd3de24838ecf18a140f3b5fadb87a
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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