Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af0f57fe3cba321…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 15:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2082c9662168b2be081f300d10091da SHA-1: 855acd398de5d4f185ae8d4eb2204f0391fd9aac SHA-256: 9af0f57fe3cba321e2e6828058c353cdfb7bb7d7f8cccf49a117ed829a9ff370
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the document as a link farm on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=google+play+app+for+android+phones PDF link annotation
    • https://livres-d-art.com/ckfinder/userfiles/files/kiditijafakorutaz.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/61194744778.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae5a3c81bd---42670905856.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/19860001218.pdfIn PDF document text
    • https://aaaxxion.info/images/file/96079527066.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/bulodari.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/jofarutigivolit.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/nusis.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/49346441386.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_536EA0CA3B5BDEB7.pdfIn PDF document text
    • http://fgosvo.ru/files/files/papiwigekagetegolino.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909092719240.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/goven.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/88986078010.pdfIn PDF document text
    • https://isleo.com/i_photos/file/sekowosanepumonofamekile.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cdbd8a19b---gabejoji.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/vabokofe.pdfIn PDF document text
    • http://altinay-law.com/images/file/bagokigogimavewetokebuwes.pdfIn PDF document text
    • https://jetaime-shop.com/files/waxoxomukotu.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210922161047.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/batajidipanug.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/4143929946.pdfIn PDF document text
    • https://artbynela.com/uploads/file/wanavep.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109141309035643.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109152005528161.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/83781989339.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9f79d9a365dd39e99d373dd49ace11d8/17689006434.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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 10832 bytes
SHA-256: 81cee69f7b0bd03a56818e54d67b240dba6ed0dfe60e6bf2e616d21b6e9bdc8f
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 17164 bytes
SHA-256: 320163db9da96e0b25fd21d99b68c413bd1c84c830ac38d9d9181ba836e73f16
font_02_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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