Malicious PDF — malware analysis report

Static analysis result for SHA-256 d959dd9e6b2dffd9…

MALICIOUS

PDF

144.7 KB Created: 2021-07-16 12:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbdbfac2da451cd241a84820e50fdeb3 SHA-1: 9ae2955049bab9cfb9cad09718e5744fa7b546fa SHA-256: d959dd9e6b2dffd9eeb8ec9829906bea9e1dd5292329a38a1ca01b05c35af662
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest this document is intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/aba5254a82e777d566ff0c4ece10184d/72476994888.pdf
    • https://atrax.hr/files/70448956377.pdf
    • http://sgpeo.pl/users//file/litazovojilewilixipuruka.pdf
    • http://etasystem.net/userfiles/files/16578630209.pdf
    • http://vivatbacchus.hu/files/file/dedil.pdf
    • https://noithathoaphat11.com/upload/files/tuxigovokipizazu.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/903a16da1d8a80d630e8740613487beb/42269942005.pdf
    • http://axwelindia.com/uploads/25546866493.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e9d0f0672f097f3a2ecc0a9439bb83ae/jobef.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b744982107a730934024c72790c7dfc/nigivexo.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6452167db---vonupaz.pdf
    • https://keluargamimpi2.com/contents//files/lagavewubovezinijavedel.pdf
    • http://softtox.com/new/userfiles/file/77289763836.pdf
    • https://kurtoglumob.com/upload/file/reguv.pdf
    • https://akproauto.com/nbloom/fckuploads/file/vaxowavorulametuzowed.pdf
    • http://intergeored.com/upload/File/kozonitizamorozuxutan.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/nosodesotugagibobaduxebiz.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7ae58deb6ecc78b7c170e095acdf7b52/27402301621.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86330047924.pdf
    • https://jxloanchien.com/style/postimage/file/fodixajoz.pdf
    • http://domplus.su/userfiles/files/bokorax.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/39e97e4aab034bed7d4d1c421b1cbb25/91304935648.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/12e03f553143edaa66427fb1aa094cac/74614902779.pdf
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pepajadasesufiluvebula.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=structural+polymorphism+of+dna
    • 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_off0001d1d8.bin
9025a032fd15a3a3c2bb2bac75171007da435c5832c3ac60f1d85a5f97bfeb81
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1D8 18744 bytes
font_01_sfnt_off0002039a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2039A 16792 bytes
font_02_sfnt_off00021bb1.bin
8772224786a2bad1cd6b2405f31a83732594bf909c185220c2d9cefde4664f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x21BB1 11040 bytes