Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c1a0c8610bee31…

MALICIOUS

PDF

91.6 KB Created: 2021-08-17 02:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bda100867edbf5851d57289c03a674f SHA-1: 4171256d40c6419d17273970ce21a103e87ebb61 SHA-256: 36c1a0c8610bee3166850aea079d19b7f7ae0562878ff02dee8f7081cb4fa0bc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://headrepublic.pl/images/files/sibebusavelafujadegilo.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/revedebapadolomizopod.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hkuiki3vtdl03jpjhmiuepg4g2/darujifajunikatu.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/04a5e0b703caa6f473918d560a9c3bd2/valadademubezujebixu.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/e68dc37117d7cdbb60079c9e346c693e/18661880351.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086de342a337---41646518984.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7t9fp7jp9t83tk202ucbafo3ve/vunakirokanirel.pdf
    • http://speaklifeiamgreatness.com/files/files/jarunewozusapufomilut.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e66cef13---58185061925.pdf
    • http://m3hotels.com/userfiles/file/88398017577.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c6137324858---70897330226.pdf
    • http://ackerviewguesthouse.com/userfiles/file/gebodebugipivubutibi.pdf
    • http://n-production.com/upload/fckeditor/file/rimijunafonunefexim.pdf
    • http://dashoernerboot.de/userfiles/20293483912.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210814_8D55DDFBB8CD9518.pdf
    • http://toitureetfacade.fr/data/Files/dewoguwuxegoguvisenezu.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/16cafeb72264a4712ccf42a5699e70a0/56916964602.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cd4598f681861427a3ea4c687155263b/gukosumu.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/6685837804.pdf
    • http://kayamedbursa.com/userfiles/file/bifojuwuxekajowajorij.pdf
    • http://ykzn8.com/upfiles/editor/files/tiwixebewonakusatowekapow.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607868022fe8f---40852066125.pdf
    • https://limsurdua.com/contents//files/lenavase.pdf
    • https://ikima.fr/uploads/file/42164323414.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mxq+pro+4k+replacement+remote+control
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 16792 bytes
font_01_sfnt_off0000f753.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 1732 bytes
font_02_sfnt_off0000ff82.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 16092 bytes
font_03_sfnt_off000114c3.bin
745bb2bca80d0389048fe1733f7c031cbf1daf7e527c9cbcdfe7abd8214996b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 18496 bytes
font_04_sfnt_off00014590.bin
eb598e591d9b518b182c5c4cd1ab2fd2f13f205d0cabdbb736b5da076e4ea4ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x14590 10684 bytes