Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e1e75ea129a029…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 04:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7429db75b1f4b5bdb7a03117eb54291a SHA-1: c1c43796c0bcca470a97ca38d84c2e9cc534d5a8 SHA-256: 65e1e75ea129a029ec12accc7007f816231818cc29d23ccff0261cf9f109e7ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm hosted on compromised CMS uploads. The presence of numerous external URIs, many pointing to potentially compromised WordPress sites, suggests a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/30973a67085ad25ffcfdd75a7b5a7bbd/bulaluvajedafapuv.pdf In PDF document text
    • http://abwjefferson.com/uploads/files/10782617880.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/97451596599.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/favelup.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a35bb2bba---telakunariw.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/luregubivazolubizuno.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fba42ee2fee---25635518305.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/90989619772.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/zeronogopefiroromu.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/57013366190.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/qup68qimpe4ueuvit4k7r33055/mepunesijebabobuleruki.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/47380621783.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca326eafa2---87546621621.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/98504321740.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/vesepupugofiwupemidokular.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/difonupevo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/37796949008.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aebe4aada---kupedanozebijiwiti.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/rolowadekubimiresu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/k9ddoa1hkmgrdef7boqhfo9rqe/gisaligujo.pdfIn PDF document text
    • http://unsersohn.ch/images/file/sexovezibadolomiza.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6ef7f5223d6f02d0affa1ffbace50320/jixuzukikavam.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/1bb78d32fc5265b954922905aa62e88a/xirul.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607716ce00f3c---ridejakerefixovok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=milliliters+to+grams+conversionPDF 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_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 17752 bytes
SHA-256: bdbc1a980e90c65acdbdefa2d1a343f5ccd6316fc514a7fefea1d62ac59af529
font_01_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 10632 bytes
SHA-256: b25a78f0c814c589cc8986f07eb745765d2d91151d380cc950381961bb7299fb