Malicious PDF — malware analysis report

Static analysis result for SHA-256 de29b6cee532ece7…

MALICIOUS

PDF

100.0 KB Created: 2021-07-29 20:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 86863f7f857d7dbd464edd29c39a1c15 SHA-1: 676f2e27ad5b9d7a8816c220730241a2780bceac SHA-256: de29b6cee532ece7682b07f63f23da69ff2b2beb938473184625f9f7baed523f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80aab8aioy.xn--p1ai/userfiles/file/meguz.pdf In PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/26677383048.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/muvevegejokojosisive.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3376661859---tawoket.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/21343866697.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/sjtef2sb7tq47cbogpl7h9go37/99084276895.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/77746149473.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160946d56311f0---faboxipijakosofubako.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4klhdo5g3iil7gojl4bbe86lcp/funapiruniwiw.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/83764800876.pdfIn PDF document text
    • http://htygroup.com/upload/files/liduregigu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/nbdpi2bcn8mmdlfj1a2f09nour/bipedapaguvidozus.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/puxakuxazukijigul.pdfIn PDF document text
    • http://progetec.org/userfiles/files/62428763189.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e969b88eb---zoxuwomole.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/22594e4d5a2b28ae27a924893bbb855c/kuxixotimebepa.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/xexulisipexaketolure.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/75965439813.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/xapebelopotag.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/kelibipaseruti.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/45614728450.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc3f3f413---45809013268.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/kuripugiwofudeponufuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+update+tc+helicon+play+acousticPDF 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_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 18488 bytes
SHA-256: 4aa7c6816a5d9508ff200411c4928e12bc7645dba1f93b84d64d6fabfc812487
font_01_sfnt_off00014e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E82 10804 bytes
SHA-256: 9571a80a2a1bb50b53e9024846c79e2f31872490c29c6da8a3d4014d29d3a517
font_02_sfnt_off00016760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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