Malicious PDF — malware analysis report

Static analysis result for SHA-256 2163e3ffcb47ddda…

MALICIOUS

PDF

115.1 KB Created: 2021-06-13 07:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a4c3dfa25923f5442ccd72e6572b24c0 SHA-1: 73c68f9bbe65218b18058369684b1e93d6ef581a SHA-256: 2163e3ffcb47dddab1b1c59d389c07374241d85fe6e42dcb513862965dad7ba5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=jai+ganesh+deva+download+mp3 PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gs4v999pcs7rrd4jf8orr5g8p2/livob.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/38931068233.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fc6a4221b---pikuxenekoxovazesu.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/zefudiverenaguzux.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02a68746b8---zeloboko.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/purubedag.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7bb7db1c8---39908612421.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa44f5e533a---vanevo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca12c21945---98787109102.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de71d05af5---839005861.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d522eb8e4c7b7cf40b839544ccb3c9c6/25625215274.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609595fdca132---bumezetilupumomer.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ec9a5adfa---83499279485.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8412aab27---73985074404.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5pse4gg8mvdhkbl30pbh6bo1l2/radawowosidu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3a2858444---donowefogelawar.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7c73d54a---30337838054.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160850dd97593f---73353766830.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03192aab7---sapuwomukuvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 3928 bytes
SHA-256: ab3956ea242da2e42f795d20b473809efcddbdfa18d2844c757d794e074e1b25
font_01_sfnt_off00013ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA2 5580 bytes
SHA-256: 227000716198a0947ef76ecd268e2fe27b634fa707e596ffb9ab3fdd32d525b4
font_02_sfnt_off0001518e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518E 3772 bytes
SHA-256: 9389eabb5da0f7ff5893e499ff791b47d46466a46589dcf6e6727fbd9e34bd63
font_03_sfnt_off00015d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D34 14960 bytes
SHA-256: 36df0aa2246577d695953a161e4d9cf51839528b3c4dcb0c32408cb27683b3a8
font_04_sfnt_off00018c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C38 16060 bytes
SHA-256: 660d05b38fea380e8cc13f4a5a7db764e9bd2a20a73145a73af50c118749f22b
font_05_sfnt_off0001a107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A107 8860 bytes
SHA-256: 2ca5746262c65e1848d3e4ebfc4c70ef67fd4fe77a02439de70d353c306a4992