Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2c440fbf35553c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 00:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12387dcaed1f4eb24ee6dcdf5267a211 SHA-1: a7cf4984e359d9b778d9cd7a68b92f43aab6e55f SHA-256: 7b2c440fbf35553c2123fa42acecd739cb96d7e8fee9ac07456f2499b36cc5de
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on various domains, indicating it functions as a link farm. Several heuristics suggest these links are part of a compromised CMS upload storage or disposable hosting, increasing the likelihood of malicious intent. The ML classifier and ClamAV detection strongly support a malicious verdict, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ahcxdq.com/uploads/file/011025485882.pdf In PDF document text
    • http://brmxn.com/userfiles/file/20210802235003_u0pcd0.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/puful.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/10565055238.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/46418430879.pdfIn PDF document text
    • https://mahae.hu/files/files/56151212690.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8f7b09a1---80459634043.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de021ed12a1---84541648214.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609600a0911e5---repaveg.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/89231144859.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/45995282230.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93cb5d9614---32173724981.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/sowenajexawadapovukesir.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/gazidofitixopaza.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/soralogeboforewe.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/xubamadedowewo.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/nagolinekunadol.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/mozifabadiginajexe.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/bedavavilulobazawug.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8304cbaa5a9f434ec17e7b46f4aa4901/zuxusukivakotefoguwolak.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105497a8ebd8---70481223430.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/81198238981.pdfIn PDF document text
    • https://eclearusa.com/images/file/18651281049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=combine+pdf+pagesPDF 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_off0000bef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 10768 bytes
SHA-256: 57c1ee652b20eb606f7633e4a46ab794ede300e8f5f3e4cc0b4c0fc87cf4fa0d
font_02_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 16164 bytes
SHA-256: 9fd9301753dd6b5db525f47b56db34f984d52ed262c2c105b486b07bc92c326a

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