Malicious PDF — malware analysis report

Static analysis result for SHA-256 626855c31cce85c9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 15:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80d3ca748236f381d68e5dc118a899b3 SHA-1: 849e2a029191bf867fd97d4ca712284fd62adaf1 SHA-256: 626855c31cce85c937e3a44ca8b23694767ccf9860a336e3d0ebdbcdc4fd0a74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, pointing to a tactic of using link farms for malicious purposes. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=most+common+interview+questions+with+answers+pdf PDF link annotation
    • http://x04ydivan.ru/userfiles/file/21154837780.pdfIn PDF document text
    • https://shiokerbau1.com/contents/files/nanavojur.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/wuniwonijarigizarazuwu.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/luzuvot.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608595ca8ee0b---dunasipomunivez.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1440d2904b---57070471453.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/93093872267.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/82295256085.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805ba757c10---dupomit.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e3c0ce2febf48b3b34218158f8969a10/boderujupitoninajuburagun.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/mojisizegojakew.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/lidituzik.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/50601722774.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dejupopikumi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608130da4ce19---raralunigopuraropixezeg.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/xologagefololorif.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b9d511bc1---6741624743.pdfIn PDF document text
    • https://blugarden.eu/file/xiletekonajejofuvodo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a62c7aba---dawudejobupudutakelobanel.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/kp175gj0jjtcv24nkb4meef8l0/62359180847.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7bf431d1---80502351425.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210801234333143.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b4f9f285ab3c1a3cca016b2a781d7bc6/85659669124.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/51781216056.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/nawazimazogu.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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 11228 bytes
SHA-256: 74871b941154f668b90b7ee686328a9a09853b302a35defda6193150c345fa63
font_02_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 17596 bytes
SHA-256: f83ed3a37cdf13e73c2783a416c2275abf98ea9c471822baed27a1f03a5d2efc

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