Malicious PDF — malware analysis report

Static analysis result for SHA-256 052ce27c36fd467f…

MALICIOUS

PDF

79.7 KB Created: 2021-10-11 00:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a33c85cc1117fd1cc1f885bb73ad0aee SHA-1: f4ea4eea2c130908a7428aa79137343eff6edf4f SHA-256: 052ce27c36fd467f4013cc68abc539e6ab3fbae95d14fe7483c9e49b383bcea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aeronautike.com/userfiles/file/72573353092.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a014468b29678a8f8980ca90d94bb889/velotetuzatiti.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452b1096ff7---bezikaliru.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/22653554155.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/resovipotil.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/defipelixixomelugizof.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/28687182845.pdfIn PDF document text
    • http://sbkf.org/files/files/58397015063.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/73518787835.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/13694939362.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/vojubujalelenit.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/31060036236.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/85949259162.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/30562535524.pdfIn PDF document text
    • http://husplaza.hu/editor_up/kadedifa.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/voxakiwutibefelite.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021106048243090.pdfIn PDF document text
    • https://noventa.cz/media/files/file/57236639653.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/83723339072.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/53633031319.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/81537909505.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/8014928011.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/otlrr7rksgf5apiv26mnbbg0gu/gefifojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=magnesium+stearate+pubchemPDF 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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 20072 bytes
SHA-256: b8bba0a5084c0c570fab2921b9c6c7a78e2f333357f2e0b966a08e872c86af27
font_02_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 10888 bytes
SHA-256: 09385a36e2ee0e476624056c3e575b686c09542e88c87dd17705d4f64f189d88