Malicious PDF — malware analysis report

Static analysis result for SHA-256 02599e0b2feb2920…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 00:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8db786c3b2ff22cf4d31e7b5e525c090 SHA-1: 031ed48a35ad4016dd55ea2409fe9eb3c023a371 SHA-256: 02599e0b2feb29201ca5deb5fca88e21e27430bd42a84d5dd720e984e8f7f468
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic firings, particularly 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM', strongly suggest malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the structure and linked URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=in+messenger+what+is+secret+conversation PDF link annotation
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ebmavuui5fi9a515s6ffqlcijf/27919603932.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bd0bd6f4---nadeguxa.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/l931e2ppqk9e274aio3qbhtfak/piweporiwoburidi.pdfIn PDF document text
    • https://mnlex.it/file/zaliwebawebulexunoja.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/829aafa0e0c11cbf723d390aa12d5f68/54251264378.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079243c1ff63---vuzuwugugalugeto.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de5ce73d3---32906175760.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/norumeterumomeviwefuzuku.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160841ec471191---50990701820.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/betidevasugakopebesakad.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/be98a8dbfe606814c8d53d3ef95ae476/6672199596.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe19a3f78---60592244511.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1183fa6e1408778f09ab20a20fb8fe7b/38721676419.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/64230276772.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6834c4c4---tulisuwikosu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5c3c469f8afc1afafa70ad7c8d3225c3/30142747509.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/49933332337.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/vekokofamuvewu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c516260d7---52258845914.pdfIn PDF document text
    • http://foodsaver.nl/app/webroot/files/userfiles/files/lorovudisibuxuderuvemu.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/91747869598.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fpr7gf6f325vm4bovo20574k96/devezexivubelex.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/65781311824.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bhcfl4ua3jridmh76v6m17ig2c/24383642146.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/93571920998.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_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 16272 bytes
SHA-256: 7ecfc9665eb989778cbe49c9f7b9eb23eff1ee332addc83f7adb28400eaec412
font_01_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 10732 bytes
SHA-256: 3336f8f7d074b5f1a4106ca904e9174635dbe3352e854679868b4358e63268f0
font_02_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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