Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fadc015512bae2a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 00:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1b9ec0ff0c35ff3c3add0853d297485 SHA-1: d978c97c14f439b39f1e05a86948037c995b2d19 SHA-256: 8fadc015512bae2a7e9c5a85140c3857808b4875f9f435af555c1a4b720db958
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://zhongguohuachun.com/d/files/gipukuri.pdf In PDF document text
    • http://dailythang.com/userfiles/files/zerovidulerafapowokajona.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/584b6c85d1e7465b2127e61a6440b14b/43867830672.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/nikarerabebowitodigi.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///tupuponawofalekip.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/63253113053.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/37048188626.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/74168672287.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d240ad4c0---bepoxi.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/pewimativasom.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tewodozi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f477182d2dd4ed0be2f2229b6370c60d/rebot.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/ropopubamolezemibomefigaf.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/tewifa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609e076e42f74---98583859202.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/zezunodut.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/komirutetijejoworo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1546bf392a---vemumulojutejiximejas.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/9eea96f9f2da19968add7842153562ae/wezezalukebutusotodanalab.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/41868451159.pdfIn PDF document text
    • https://laser123.com/geektic/files/14539978604.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161117795a8180---42479493954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=drug+delivery+system+ansel+pdf+free+downloadPDF 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_off0000bd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9E 11208 bytes
SHA-256: 86ae610c68a53ff14a6d0d900d48acf940957686853eabfb822084893ddc6c1e
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 17052 bytes
SHA-256: 580735443ff7973c20e621ed26ba3a4797d1819b1e14c73eaa3e0afbbf5fc482

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