Malicious PDF — malware analysis report

Static analysis result for SHA-256 b825fc66c288e0a1…

MALICIOUS

PDF

70.9 KB Created: 2021-05-25 16:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bd7a65c990ccab84c763ba4cbce05cf SHA-1: d508bee69803e08d56fcd415bfe6c927e00601f0 SHA-256: b825fc66c288e0a194aedd2fee51c78b7c9c7ab046f22fcac23243433b42a0d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some hosted on compromised CMS uploads, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9693

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crysiq.ru/uplcv?utm_term=2009+mathcounts+school+sprint+round
    • http://aksaaydinlatma.com/img/editor/image/file/gekoxuze.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c90c2cfa3---16240457961.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac651ce890c---89343398828.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725823b85a6---2802241878.pdf
    • http://adams-gold.ru/archive/image/file/67667353742.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082d6835942e---87589182729.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef680bb48---suwumiwenomomaxibabi.pdf
    • http://ahkjt.com/upfile/file/xizemokatuz.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158677a25b---80848644473.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/d5a1829o618ms06sm8916fo3nc/99016985095.pdf
    • https://fedico.ca/upload/editor/file/vigamenopefilex.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960eb128fdd---zejasuwusegosadafi.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r68ogbp5civisnnrv3ikk9m3nt/kipubiwumusigisenan.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce2fba7077---kadujoroweba.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d08ed8ce75773e5c7dd05b97b6650802/26803337595.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3a42d3036280929ebd559ff7454cf990/41955940751.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768bf6d3770---rerasofozalovo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1df.bin
cf513f9cb5cad6bc6c4c8a7ba0e33f901b01b1f0c11e1aa721e2370cc0f06b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 5648 bytes
font_01_sfnt_off0000f4de.bin
4be2d90d2641d95043355e1bde6d6cbee106c03f586f0f9f124043b203646c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 11144 bytes

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