Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4c27d4ed809224…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 03:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c09658b4f5af5ed33c25160310bc620 SHA-1: 025bdd48ddad4d0255e87581162e11b0dcf87531 SHA-256: cd4c27d4ed809224277f9ed77fb8139a451817eee925ce77565c05d3cfb6c239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fruitvita.com/files/files/vizirekitelumekidamibaxat.pdf In PDF document text
    • http://poslovniimenik.net/firme_data/files/wevadewiguwuduga.pdfIn PDF document text
    • http://rc-modeller.se/images/file///keridixe.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/6268755793.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7690a18c8---36925216937.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/zuxipesikewizogo.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/31763153606.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/maxoragigukumap.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/pipupazig.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/voxarikibawobupibexanava.pdfIn PDF document text
    • http://agavietnam.com/img/files/78852498843.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a998d152---18401474773.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/kirorirolulizab.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://wingmanresearch.com/userfiles/files/37256784692.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/pobunow.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/bowir.pdfIn PDF document text
    • http://domplus.su/userfiles/files/38647197839.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3d57bf1a---94336084031.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/75756105716.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/toxozoniserepon.pdfIn PDF document text
    • http://goldmustang.ru/files/files/7478733750.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/78037649768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=glide+android+kotlin+examplePDF 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_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 10620 bytes
SHA-256: 77774a1275214349f869045851897be2bd4dc3a67f0b35cd8eca9dc559f1fd06
font_01_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 17656 bytes
SHA-256: 3866abb96abf8003330abd444175a6952a9b9d2a1d79ac175a500489dc27b1d3
font_02_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1