Malicious PDF — malware analysis report

Static analysis result for SHA-256 7450096c6842bcf8…

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 03:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 23d12a666be1e8bf0e23fef0b1290283 SHA-1: 06e9f4b65700193d4bccd1b331685ffa1767f3a6 SHA-256: 7450096c6842bcf8f3e6af0134236098f5c4f17d85ff2d4323d700f12eb01a32
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or spamming campaign. No scripts were extracted, but the presence of many external links indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://sjhtractor.com/d/files/fopasopogiwevigabubob.pdf In PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/fefenelovivukewowa.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/wonoxafofinifezu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cf93208afdd79fdab46dab518c6cc4d7/ruzuxafefudonefajido.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081716ef1f20---labafigeganawapel.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/bojorizapanazorefivifu.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/dudowudavade.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/acd01f93ab83c4c6aa91d84a878bc091/mefevuridakigaperakenakar.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/22781715459.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc01e9cb3---tabotukanivozulebababu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fd281bdf8faef0e66ca8028ef34632a9/61892912805.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/rixisonelapox.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/59328920102.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d171bd8af1---fumozopineramejinabam.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e909b636a---tidowagomele.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/81033650638.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/17394110724.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1750275e---73461713452.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/39874763502.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210523080151.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcc1ea079---selebab.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/19400961322.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/55fc471a7608755d30766eeac18abb98/gowupuwowu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/d767245731eb1e83044cc5e829af559f/kutubabigifulisib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=good+substitute+for+fontina+cheesePDF 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_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10804 bytes
SHA-256: 5a1ebc0bf96b25066cd26cd9a7e03325a4c6bef04e163f672063b9165bd51991
font_01_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 16660 bytes
SHA-256: d2a91753e644044ea99a0e2481e2c00c3e77caba855520fe8af70ed231f84546
font_02_sfnt_off00014047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1