Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd53c73c1f926fa2…

MALICIOUS

PDF

82.7 KB Created: 2021-08-13 11:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55e64d94ce7275fbaff809e11fbbd30b SHA-1: c34cff03307b3d5cc0c35ea4c453ac04966897a8 SHA-256: fd53c73c1f926fa2e5922667cdb37e37d8c7bcac91e07950a1848a668c2e8841
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a link farm strategy, presenting multiple URLs that point to potentially compromised websites, likely to disguise the true malicious destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's intent is to trick the user into downloading a password-protected archive, a common tactic to bypass security gateways. The ClamAV detection and ML classifier strongly suggest malicious content, likely a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lumieretvie.com/userfiles/file/kevop.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5d07934b---nejozejatamap.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/84850257350.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/26719943877.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/63421d88da7f83af5ed9faa27ebda759/38250920896.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/zidumadu.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/xugirokim.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/23400072224.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/fikuwetizanajone.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f638d991bed---27322604609.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/kogavejajinogonaxinuv.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a6cc266c8ca0d29e266f9367960641aa/risemijujeparara.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/tuwijajo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db4f01f92---xijap.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/74564203086.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/864ss07cfe9hm1v7npogsinudo/38424739794.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/25046113183.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340b2c7c1b---zajovi.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/5288586258.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/65563004051.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/20210168799.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/rigimaxirumuvulet.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/44815390838.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/48043006758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=david+g+myers+psychology+10th+edition+audiobookPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 17592 bytes
SHA-256: e8a90c3c74e7d81abddfaa1b53cc4e2471630ae7233d70a822e33fef70ed6bf5
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 11648 bytes
SHA-256: 2a0fe4f9dc555dbea830bda010a6569cb7b0f2e0834388bf72f9fd1eea3fbd36
font_02_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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