Malicious PDF — malware analysis report

Static analysis result for SHA-256 86524c231c8c6f7d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 04:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0351e890ed39807d9cda522439875039 SHA-1: 10f20bb6df0f21b24bd5887df55a091d30053bb2 SHA-256: 86524c231c8c6f7d6adb7333e8c9cbd9a7baed787b4124d22f33f10f37d1eef4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be redirecting users to potentially harmful content, such as phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://proxus.nl/file/29365783370.pdf In PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160751f14e7013---70283771212.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/24673148915.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e370926ca4d---nisedadukubupej.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/4169581842.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/gupedomedunitamaxejumela.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/66259321920.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc0b3fb51---xefit.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/82175908717.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e35c9b62f---36297856714.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14cc78b41---zufuxafugi.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/rejupitemutiseze.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/20837534268.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0dfd0ff5a---pezujitog.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/67114685781.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/47476179013.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pc528nqe48ratedge6oe17jbkf/tidaxaragexegajelijatov.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/verezovun.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/phrf3jtkao2dab7niij8o3624a/piforab.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f14c2149861ed9e7fb08aa46b4156a87/gizakisizuvudixugibab.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/dokimusegijevibojovivo.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/98183177424.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/masase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=biomass+to+renewable+energy+processes+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_off0000cba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 11356 bytes
SHA-256: bfa46658f49fee115eb506b8d7122c5abcd36597ee3e041cbd6ca0fa386b6770
font_01_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 16524 bytes
SHA-256: 7f31f08e4783e24fb27eac06e4498c0d7bae50d3cbddf23ff63acd16a9221497
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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