Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3ecbcc1ba563dc…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 02:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c055a4931c9910cf1e7b152ba0f9d75 SHA-1: 989e464f989c11dd3f0af7687fc321722480220b SHA-256: 5b3ecbcc1ba563dccddfe4776c7dc9245e3dd5ea2ef96c39bc1521fcb04fc753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or domains that appear to be disposable. This structure is characteristic of a link farm designed to host phishing lures or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://anukulagrotech.com/userfiles/file/82258656496.pdf In PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/76194550830.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210514123223912.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6f7fafc3f232e07b8c65aa8509b517d4/benidinan.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d37792a8422e6adc211242b0f98c6fc7/55367812132.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/715f14a70af8d8b016c80ace7247a793/zomoresovegetatutu.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/18628624882.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210813185317_830479819.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/aff01e94e5a50f4f2845a5993cf853d3/votajoluxalatigujepit.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/rodozamikoxefobafe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0199759285c21eb6aac15a9816428658/67183418659.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e1878c3f4b---72679367465.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/tatirakosibile.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a88eb148a1e---rofisisibirobikagu.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/32624707862.pdfIn PDF document text
    • http://foodchemsino.com/d/files/16887303002.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/92472829928.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b706735a---barekumepabozovulipobif.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25712493b7---82893968953.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/gedojuzetapalafigemezam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mamma+mia+movie+piano+sheet+music+pdfPDF 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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 18008 bytes
SHA-256: 886902daf548cf3c691f53ac813a36dfddedc98cb53068270db446326d8eef88
font_01_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 10900 bytes
SHA-256: da8919cd254058c36bbbd261878dd58a79c83f1626310357e411a4c32c31c0a4

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