Malicious PDF — malware analysis report

Static analysis result for SHA-256 9885ec36fc53ede9…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 22:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 73337b17100cc9e0ddfda122b6413da7 SHA-1: fae5598e3cad664d159306812f045f866524f1cb SHA-256: 9885ec36fc53ede90594cb35a40d2848a9b26f4b9e605e2942e66e3cb5f3f9b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to lure users into downloading further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f004338552---83838174135.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e3c8a7bdd3df9f833d90ca460f385f41/45796167537.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dvhdpa365cch4cs5nmtdipc8in/38082529982.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091a069f3bb5---3832708550.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9a84f447eb8029316995dab438d99eb8/9528744096.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/f6cfd4dd773808238f40f33b1e1e7f4a/zajugewutopafizok.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/futiregasupag.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b08331e3---10307734273.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee8473dbf---rimar.pdfIn PDF document text
    • https://kham.vn/userfiles/file/zamopefepuzekakibelu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/54703450259.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412468bcfd---mimusil.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/68893415244.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/41377810373.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/xosirakopariz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/reid701vjlkdnr43bt9pculpv1/68486454097.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/275579be50623d3104c1fb01a4452c11/41991935462.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/956404cd6a15886ce6ce85acd2145549/64567750498.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/92911213794.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609234e188abe---80257725534.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fibijevatam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=alteza+residences+for+rentPDF 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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 18008 bytes
SHA-256: 834a1c16869de7046fb06e3b80b5f525754d4c074d4d0ee2da96841594909722
font_01_sfnt_off00012678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12678 10512 bytes
SHA-256: 4f15372dbd77805c9bd030c390e6f16bcd3287aba899b3608104fad1fe74a32b
font_02_sfnt_off00013e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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