Malicious PDF — malware analysis report

Static analysis result for SHA-256 7187ce1ed74750c5…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 18:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a92dc27c3be4a1bc2bb959f691873deb SHA-1: c6d9901930302de67b5f11b7abbf48bc7c6ee63e SHA-256: 7187ce1ed74750c57d8f7d4b1914d026a7eb23b9ad6cbbcf0905fcbb3b661843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites. The embedded URLs and the PDF structure suggest a phishing or malware distribution attempt, likely using a 'package insert' lure. Although no scripts were explicitly extracted, the PDF format can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/d8a8ab12a8d6134638875543bd27fc9d/pivebifatujabavut.pdf In PDF document text
    • http://studiorapizza.it/userfiles/files/takiw.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090613342073499.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/76881641482.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/8145612571.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1faedc485---25751292491.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca396f75d00830906722345252c41648/ferisenetidifati.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3f1456c40fe105fa31db24b6953a5aba/3264485312.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/31379070497.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/42471006629.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/829bc2e96692b35537b10f9d8375fb2e/22553921759.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ccaf423f1---wotivivo.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/95020777438.pdfIn PDF document text
    • http://envigest.cz/upload/file/69727919633.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/rijemabuwodi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/g8roivqdmv68ooaqhrp1j22te4/36951287754.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/vafadigulonusobugi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cbc81ece---2741139684.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cea2c938d---33087125779.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/46737627408.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d32c3b36---10654292570.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/zonexiwum.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210824170047_1109535060.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/45d9fa24d9f6b298d30d6916184870ce/domirudugowakuwewug.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/12449381247.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/58938357653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tykerb+package+insert+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_off0000bfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCF 16140 bytes
SHA-256: a9555e1f5c437625af7248b4eb5ffb1db2538a5cc55426f643b1f2092beab25e
font_01_sfnt_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 10940 bytes
SHA-256: 0b2291daba08391f8ca044e8c9ff97fd36764103456f9b3ac100b0e8f0188043
font_02_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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