Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cc50c9903ac995…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 15:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26234dc2f1d8ea8585c1fdbed45f11b6 SHA-1: 3fd49cde8a979a94802b9dc7c36c9b7a0d5a166a SHA-256: 45cc50c9903ac99556a76110f40aa976fa60eb8cce749f8a069a8a810b4681ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=gopro+hero+max+manual PDF link annotation
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0c2c143534d7ec30bdfe530a5e8aa162/nenifezemekado.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/17901308306.pdfIn PDF document text
    • http://atrsara.ir/resource/files/parirodofonirovitup.pdfIn PDF document text
    • http://goref.ru/files/file/nasewazumo.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/90424953902.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/62392019937.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d8a86ad9---vomozatunegeloz.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/74267761876.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/47689760671.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b37223deee---18274076977.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/tiwowagixajipudegok.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/kg3tjc5s8o8ks19oou7cv4f59o/65393891696.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kitazaj.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/fabuveg.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99ab9b9cb---mirazifewimatufiwere.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/kapegabavosixa.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/97726424309.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/55c4f45c16f7de6ce83d905b522401dd/70146714447.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160912a7380038---kasigedodosoj.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/44371442668.pdfIn PDF document text
    • https://digireg.es/upload/50673743862.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6a3f4eb6ebed79e630152d42969cbc60/zexadilu.pdfIn PDF document text
    • 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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 10400 bytes
SHA-256: e823671627b8990d7cdf40a5e9b9f68a93da9f5095c2346474797c941e75cc33
font_01_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 21908 bytes
SHA-256: 1c0f9198ad99843b97bb965d18a1e618f5d5e78cc6187b55986b2327b17468dc
font_02_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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