Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ac8865e699fc97…

MALICIOUS

PDF

96.1 KB Created: 2021-07-04 02:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 95fe626a23292e86f5397fc065c3e86b SHA-1: 41632406591e67fdc5b7f30aadf73c68c3c2ab22 SHA-256: 57ac8865e699fc9700f0ce1438d813322c78dbe8290ffb58dffd9c9306259f91
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://medvor.ru/uplcv?utm_term=simple+present+tense+definition+in+english PDF link annotation
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/38b1a1020e39a928c61b3647e5b64004/jesevonusel.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/c277ct0udr1ehs7b9qd9llrqfh/sizaxedu.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/jasaveminexunajarodirixo.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/75059255336.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/fb48709458d7d5f661588e5c46c61096/kezum.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/829bc2e96692b35537b10f9d8375fb2e/22553921759.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/zekogugaruzogafexi.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/27376100349.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210507030103.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/82410998751.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/diloxopolokevewaw.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/funozepokudubetaluxom.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6068657232660819ca87753f25b856e0/vanopipono.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef43445bc---73151720943.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ae1ccba552022673e5b8dc710457036a/mumoximiwodijabepod.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisifuk.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/t7e87vnpcnm9lf1qm7pfoe27s7/kalivuzotivuleketexutuf.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607574a4d35b4---kiwubijifoxonidago.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49613e1381---54886796255.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/witegibifasijidenowowiko.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7ee597af7---pukurelovakaropi.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ce7fc0d54---jivubadarenisat.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/dovdhnekp7ciru3o6dt33bdj87/fepagojimotaso.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/52637410780.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/tedil.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011089.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11089 17956 bytes
SHA-256: 34970410dcd3524643f07f1ce2ec7c80b2d9cd9ff53e7427db2b846faa773e38
font_00_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 10856 bytes
SHA-256: c0a0a898e5cc9db921d5e9d9e349798b7373cc84ab1218431509e63e0dd7f803
font_03_sfnt_off000144cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CF 17408 bytes
SHA-256: 2c2d810e6b33711354e347a1cec0f4318bf4dc885c2d79a4a275156bcaf9bc27

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