Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d5763960346e3a…

MALICIOUS

PDF

87.9 KB Created: 2021-08-30 13:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68c7ba0a6570b946bb2f7c357b4bd327 SHA-1: 213bb949990d7b12ea395a0491eda3356690cfb3 SHA-256: b7d5763960346e3a2655e8abd65b54d92d6ed70cd58b9638822ffb3eb4c244c6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, many of which host further PDF files, suggesting a multi-stage download or redirection scheme. The presence of numerous links to potentially compromised CMS upload directories points towards an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/mjc0604otn62fa0hd9nun521ul/wofomarabuwupivejef.pdf
    • http://traktorpulling.de/ablage/userfiles/files/pipaget.pdf
    • http://domusanna.it/userfiles/files/66942277053.pdf
    • https://carolinevlieghe.fr/images/file/xojevaxasive.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/i9ak93rnrahbcmorr0abok2li0/madojara.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7aa443077---nofanume.pdf
    • http://geologocarmignani.com/userfiles/files/tixomugobuv.pdf
    • https://baglab.pl/galeria/file/88200472140.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f3206173b93185985855f60eb73fb9fa/91738582682.pdf
    • https://lanjutpt1.com/contents//files/3391362207.pdf
    • http://tatnhapkhau.com/ckfinder/userfiles/files/zulajise.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c63605bb---bipapanujatafabel.pdf
    • http://4grd.com/cmsimages/file/palaxefubilabazafasuz.pdf
    • http://vandientuchinhhang.com/upload/files/tekowuwoxezeva.pdf
    • http://becskeicsodajo.hu/admin/fck_upload/file/22847316505.pdf
    • http://www.kammerpop.de/files/file/91589950733.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160baec65afbc8---65135923088.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/413beb2da867ab3930755036d858ef67/zopuzasonujosexededad.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/20269d3765982737fab511177f9e94c0/84384122115.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abe84eb6ad0---47340450749.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/13eba6cb21f439f3acabf56123a5746d/vavipewanefabokusi.pdf
    • https://ludifrance.fr/userfiles/file/86949779842.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+colby+jack+cheese+good+for
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 16792 bytes
font_01_sfnt_off000106b3.bin
a8ea8109e372ba879eca3ca4b734b4a00d89a2cdb60f8a7a84568eac362b0eb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 18956 bytes
font_02_sfnt_off00013805.bin
b0716243eb9c9a67a349b2cc8030bd23b462262411354acb4493f08d18230cee
pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 11120 bytes