Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1af9d7a01021136…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 10:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ca955f39e87c0794e7e193df0357313 SHA-1: c21f3b15a4bad256cf279f083c4f19bf47b46eab SHA-256: d1af9d7a01021136e72b4ae5392bb3af80b0efe7bd4eb30131922e1327ca187c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the attack pattern of using compromised infrastructure to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=definicion+de+diagnostico+empresarial+segun+autores+pdf PDF link annotation
    • https://exam11.menapoint.com/app/webroot/upload/files/60059675106.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/dejovofodu.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/56100305202.pdfIn PDF document text
    • http://skomi.ru/img/files/file/46009632802.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bae4684cf02---ziminegovorasegaviw.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/p28fs33cqejh8dfqf595otq0ng/78091453163.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/wenimujewaporopu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/pewubu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f52b925f5---76622721674.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mgfcref70irojm1gfueh1915i7/korujaxot.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/pisenexu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/1304793986.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/duretikufasinojatezow.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/govotinosolujujevaw.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d21a0688---mawujoladuxe.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/58850176401.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/sirolaxeneno.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/fetelisavoguriji.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/82234953368.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/jejofamedoregexapomavalof.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/38694316914.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/34231900801.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/rudomeripajuko.pdfIn 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://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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 20076 bytes
SHA-256: a3ea11181da5f78a6d5c213a8781d08da27c43543e200dc6c37430c2bb129d51
font_02_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 11064 bytes
SHA-256: b2bbb9458c460d520a5dfebe894c0e99b1c4364711a601cec527bf9fca85ed3b

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