Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d2868a7ac8a45d…

MALICIOUS

PDF

88.8 KB Created: 2021-07-19 23:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b4847d3f36aab56924140adfec39569b SHA-1: 4f406aad97ebf04fd48a67fd33d8525b8c00c48a SHA-256: 81d2868a7ac8a45de97e3c141d12c99aa2d968e6bcdcb83045ef311fd0dbdb32
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The PDF also functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other disposable domains. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160853db11f620---60630907243.pdf In PDF document text
    • https://bocion.com/ckfinder/userfiles/files/makewiberexaxe.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1f408508---vadatijikakugokijatogida.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/92719722769.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927e169490---96234890864.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/luvamupufixax.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87fd897cb---pidapefezojoz.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210630_D2140A9D5F17D9CB.pdfIn PDF document text
    • https://camelcarpet.org/d/files/kesagatirededudat.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/un8f5b5q18k10gd1miro8hlm9m/35662651435.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9db88448c461f207c7e99ec57cca71fc/75403450470.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fadezaketate.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/onrbmana3aagpjaun5lc7ur3v5/sezifurebojawezokazimexe.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7qntj30tl6p47hbepl8ffd36h6/doganemabokolesoke.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/3104714543.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/jerukiwivavibus.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a28cca623a3---bibaduxakeforomugutad.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/45034775406.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/novujodimilijasexurof.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/55090968480.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b6d7d8e626a9471f432a4fe8016928fd/vigubafonufezuxezoparig.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c661a5739a6---fakorufinewitogaginili.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/68415681611.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f755968e88---dugopikonokogobobe.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b96b42d79---60675525348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ecological+importance+of+waterPDF 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_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 10724 bytes
SHA-256: 345ae4ff09d9d9524a1bc65d5a201c2531e026da8018d28e189f3f222491f33b
font_02_sfnt_off00012aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEF 16496 bytes
SHA-256: 58df345d926167dba761a7f7fc9c1ac057e0a779f21d6ae005fb1b3f54144e1d