Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf1982579ac3a36…

MALICIOUS

PDF

98.3 KB Created: 2021-08-04 10:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48e342f56e0a0743ba9a179cf7d561f9 SHA-1: 6cdd41ea3abb488cae5fb973fab57915d4d7527f SHA-256: 1cf1982579ac3a36f407165c187ee468a6c7dff651485d6b4f3e0954855a940d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://nomylo.ru/uplcv?utm_term=what+is+a+quintile+class+rank
    • https://nestaerospace.com/uploads/file/gurowodekezituzuwunufoze.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/b1p5618f9vdmpv45g4glvs9eal/gokobatudufonoberoduz.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6fbc644cf9ca93cb2fc9bab45f7b05bf/18337835588.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c922de9bd---25894708012.pdf
    • http://amandamaitland.com/images/file/86846019954.pdf
    • https://anakmeong.com/contents//files/85284617487.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/30b92ede1ab5c2843baf27dffc2ac72e/wufovetijinurejulinalofi.pdf
    • https://carrieres-pierre.com/userfiles/file/siruwerapad.pdf
    • https://alshamiltrading.com/alshamilfiles/file/netegake.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jk863j7cqfctm486jmn72pcjf3/wafagetuputidosofajujud.pdf
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/76385396884.pdf
    • http://jrpst.pl/userfiles/file/vajur.pdf
    • http://biswasi.com/userfiles/files/roxiwobasubirama.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67101244bd---dilasukoreni.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/pcecsuuv5mov2sq1b5gnkj2pqt/medurobifopawatevagewiz.pdf
    • http://lso-msm.fr/userfiles/file/xinipamewafobonagorewu.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80816dc3ea---46260664353.pdf
    • http://akcjonariusz.com/UserFiles/file/3413302398.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/aa38f2268bb79c5b2f30b5a247b46515/10805696540.pdf
    • http://harryreichert.de/uploaded_pics/News/file/feverivalagujupip.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/926e980cf26ebe221ab37e9710b4847e/85961048869.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/q6eriiu8231jrt8f5uuelfo331/16080783138.pdf
    • http://agendaalzheimer.org/files/galeria/files/petolomedu.pdf
    • https://rinducm1.com/contents//files/zukub.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/37043251947.pdf
    • http://businessvaluationapp.com//fck_files/file/naseligexivuvik.pdf
    • http://e-sportis.com/images/upload/5318769964.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9b9c23f15de3f061df29ab017d1b276/10436409736.pdf
    • 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_off00011d9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16792 bytes
font_01_sfnt_off000135af.bin
8d0899b87b0ff8bf18573bb2399421c8db2b044763e50699dfefc3a1cec81720
pdf-font-stream PDF embedded font (sfnt) at offset 0x135AF 17104 bytes
font_02_sfnt_off00016254.bin
faa1bed8857fa76b082447fddca618fb0db9e500b0bbb38524a1bd66cff93043
pdf-font-stream PDF embedded font (sfnt) at offset 0x16254 10540 bytes