Malicious PDF — malware analysis report

Static analysis result for SHA-256 328758452bf528eb…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 07:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1b0769356d4ce57137c9600f12b49eb SHA-1: 4eced8110d3847c44efca48bc16de60081295a3f SHA-256: 328758452bf528eba33fb7943c5b04adb28774a186be1af15c9f377307743081
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ribaczpeter.hu/files/file/50002639199.pdf In PDF document text
    • http://candientu24h.vn/webroot/img/files/silominejupenid.pdfIn PDF document text
    • http://519pf.com/userfiles/files/vagejezenosimuk.pdfIn PDF document text
    • http://intertravel.hu/_user/file/10424305288.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/8722094282.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/28888408904.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/88212bba256ceb802c5f4c98c04685ab/vuxezu.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/34887753819.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/motevuxevodalib.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/26854314491.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/af18dc58d8c95fed8c5ac6ad4b7540bd/boxane.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/15466410150.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/80400011975.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd63bbeef8---mizene.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/fuzipupusavo.pdfIn PDF document text
    • https://ksuskalology.com/images/file/88544125587.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/74772534569.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/pazifez.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/54723114391.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/vitamowivameb.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161321942b52ae---49425774298.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/44002182460.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/78511480856.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b8e2cf7.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/tiwotitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=steel+column+connectionPDF 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_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 10136 bytes
SHA-256: 42057ae6c488b228c8cc262701e71665439ad1499dbc54148ac09f560571aa10
font_01_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 16444 bytes
SHA-256: 505cf8ffc1edd5a34e0cd06aaae6319d3d0392a78da701f8b54d1c4b14e65a8a
font_02_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1