Malicious PDF — malware analysis report

Static analysis result for SHA-256 952d3e1b786996a4…

MALICIOUS

PDF

86.1 KB Created: 2021-07-19 19:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 86b40953548843f3a0b3ee4e98682159 SHA-1: cc9f063769c9d7f28636ec529652e4bdbff114b9 SHA-256: 952d3e1b786996a40f7e245a7ef85236e61562c428260d04091b46b601d80de9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/88a5ecebc351bde83b130a540d0320b4/27259705973.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37a20f95ca7190bef7d1ac36c2b76dd3/82937077133.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/d4e0b39f3be0b397f6f7876fe71e9653/670116160.pdfIn PDF document text
    • http://yilip.net/userData/board/file/99169730774.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/fovadoravufezabodewiluxi.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/54624105369.pdfIn PDF document text
    • http://haki.vn/uploads/files/553855170.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/50j04ip6cvgr1gnh9ihrs5peq4/nuwujewagajuzinufogagu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3fff13696---nadawexotexoratejedogab.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/64599373145.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/21367448423.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cedfb8e8d08---76886621737.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0241d5e02f---56692387890.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/vifejaniguvafabul.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/73495561771.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/5158791777.pdfIn PDF document text
    • https://tipresentoio.it/images/file/jegalobefinol.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210704_075312.pdfIn PDF document text
    • https://bataretak.com/img/files/file/texixenazejorupakikamog.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56f491660---xorod.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/57206307395.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/fapoloferuvota.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210712221516.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d937767204e---71817929098.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mujimidipaluvexepir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kevin+holmes+zoetropePDF 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_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 16872 bytes
SHA-256: 76867ced9485975886bbdbe9e62a6a7a8d09dacd38b7831ebfbd97ba7a1ecf9a
font_02_sfnt_off0001322b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322B 10472 bytes
SHA-256: 36a21b63052dcc6d75643ac400ced93bff6efea80f2f6219e3cc69c14b27fa2a