Malicious PDF — malware analysis report

Static analysis result for SHA-256 396dc0dc76143b3d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 15:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cebf739e9aa4898d6e4e5f8490b2820 SHA-1: b394e97f5bc8cdf513ad03d6317fa838593ac444 SHA-256: 396dc0dc76143b3d0a68edd3ca569dbf7da9f049640e8697fe149c557f5660f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eniedu.com/data/file/20210903130751.pdf
    • http://eiak.org/upload/editor/files/35875574430.pdf
    • http://erulingua.hu/uploads/content_files/files/gitabamimijuzasepususaw.pdf
    • https://rentcar888.com/uploads/files/202109022005008389.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/zukukuvofazebazoxilupo.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/30015574722.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/xezenufavoperejegukin.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/974f861f2ae2d0ecc5d25675dea6c7d0/dalani.pdf
    • http://www.kevimotor-rock.hu/files/files/16847338800.pdf
    • http://turksebruiloften.nl/userfiles/file/48551503968.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lv2j07m68i44vvq0p99f5hf7f5/kusef.pdf
    • https://tatsolarlight.com/uploads/files/ninetutopesupexofifimoxe.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/umnqcve10vf749djo6d10qitf7/10450886834.pdf
    • http://medica-eg.com/userfiles/file/72183303973.pdf
    • https://lyubomiradineva.com/files/file/79118621660.pdf
    • http://whuntex.info/userfiles/file/99258980117.pdf
    • http://2safe4u.cz/UserFiles/File/detawotutamolojijal.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf91299c1---893636163.pdf
    • http://mediacast.vn/ckeditor/upload/files/74407827682.pdf
    • https://xn--psg-9lac.hu/files/files/98179436312.pdf
    • http://bctlorraine.org/userfiles/file/61261994866.pdf
    • http://crmrealty360degree.in/ci/userfiles/files/kadevinusuvazolijeligise.pdf
    • https://diarch.in/WYSIWYGImage/file/bexotiborowupe.pdf
    • http://szm.hu/userfiles/file/nijapadiwowoko.pdf
    • http://remobudostol.pl/pliki/mufakuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cara+perkuat+sinyal+wifi+di+android
    • 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_off0000d802.bin
86f0533beefa6243ed69c2dbb101740b31e6c54030c3633947649075194d55a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 10912 bytes
font_01_sfnt_off0000f17a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 16792 bytes
font_02_sfnt_off0001098c.bin
c4f392271464aa744840306f0e071ce8659c95a1844a48381875130db118022c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 16700 bytes