Malicious PDF — malware analysis report

Static analysis result for SHA-256 707daab34a41b09e…

MALICIOUS

PDF

88.8 KB Created: 2021-07-15 21:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34c864341d5e5c6434ee3adbc94712cf SHA-1: d82b20260640528c7d76a9f16afc8cef9d47d3fd SHA-256: 707daab34a41b09e92e222bf3c18e714629bf2f7f4b40b8aff0f97d85965bdd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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://huntic.ru/uplcv?utm_term=types+of+gold+nanoparticles PDF link annotation
    • https://jetaime-shop.com/files/dixixatas.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/sazuloxew.pdfIn PDF document text
    • http://bptramptour.pl/files/file/bobifojota.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/tonefe.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cvaak25c5j0dtlk37tnhgakut0/20653130044.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00a73c8410---sutakiliwogosomojigomi.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/38359394470.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/67d8a10f028e490d027a22851d133af7/91857409326.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3590d5d7d6---48693158529.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807952e30dc---kuxevorifevulojefenovina.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/vazope.pdfIn PDF document text
    • http://heizler.hu/files/file/83165178038.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/49737996708.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/bovoloxazefovuzivavedik.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/kuxesodobedal.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703c1e8a01---24170772034.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/ruxulinosafuj.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/makiwikibewepabemanaxiwip.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/wululadaruxulazuxediv.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607560e3346f6---55470191653.pdfIn PDF document text
    • http://nprofit.hk/userfiles/69552644856.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/diliramivetuwinikelo.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_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10872 bytes
SHA-256: 965f9614740f3b223f5a1eb305fdfb58a1838ca0a5b9cb9680fc10350ea6abef
font_01_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 17628 bytes
SHA-256: 0b461f69352258a7a2204b8492713d35343d84a8dce9af1b87d4c7f9f610baf9
font_02_sfnt_off00013dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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