Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b0eb26c1accbf5…

MALICIOUS

PDF

95.2 KB Created: 2021-06-28 14:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7b7c3555ffe4f91b89a94a30744fb135 SHA-1: e9e57e9cad700f7ae73d8449a7f28a1acea2bf5d SHA-256: 53b0eb26c1accbf5dcd915f2ed827ea47ec3c61eac0795f703eff52532ebbdfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to these external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded links are the primary attack vector.

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://nomylo.ru/uplcv?utm_term=the+main+function+of+the+human+digestive+system+is+to PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d0eec495d---87414320383.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c623ea699---nuvogubojanakewamuvebozar.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/570e0916da018ad4ca8b8c45d3c446cb/21986869390.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/xapibujobubanowezexi.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210607_5B68F79EDCB17E4E.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe6bc27e02---begowijit.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/sulajexevixegusegozapiv.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/lefelopisuvigojudinewu.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/lizuxafasisobuw.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c3b73b5b---3060926551.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160942d93bcd3c---xukatikixepegu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160877e8537ea4---84024199875.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0983e194a89ae68c38d1b8ae69d5e931/7406205604.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8251d6acb---tukafobuzudikepirekikik.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/56c2762a1a700ccc3da6c97fbd5a5c23/zarogugipusoxusip.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/87328048997.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab802bf9eb---4053079862.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/586ddf320bea6885dde55ce5c139d9f4/84731982629.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/97d7623868bb7a40e68bebd1cdd84e97/jifijuje.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b376d0a90b---41139224948.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3f433cedb9b80ed49e4e15f2fcceb08a/20320329309.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vcmr0oq0fdkfpau9i8acktcc8p/82885651590.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa55595931c---87869117667.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0396cdcd2---xuvesakijifotowog.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
font_00_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 11020 bytes
SHA-256: 78e415358e0c76260b7d4f684a2dcba497c6ada0b7554f00500684c18ad88542
font_01_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 17152 bytes
SHA-256: 09ed8bbad9d14a5d6d960200cae5e27e0166c9ac36ea3dcff60b8e4b7f9bce9e
font_02_sfnt_off00013d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 17072 bytes
SHA-256: 0441517957a57764ec6c39cc300e9647c2116ecc62658729eaacf2fd2b12d513
font_03_sfnt_off00015645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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