Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c50c0d3191c717…

MALICIOUS

PDF

105.0 KB Created: 2021-07-09 16:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d735cec303dca926114d1e9f48fcf0ef SHA-1: 9f3465ff446dbe69071263c5c0614b148913f042 SHA-256: b8c50c0d3191c7175d69f6e45d080ce5c8c8e4d8dcb418b6f1f644bd90b49125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • 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.
  • 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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2d162959dccbb07d99aa7cafa88305b4/74236929252.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160981532803e0---xajigizijixeluxopet.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075acf806d04---lozesiduw.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/63324450302.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xafamenajipif.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/35611904427.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0adbb5d5c507ffc94194921b799ec52e/zukilijulek.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc26ab61d---2241290140.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/40637903745.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/tndc275m4hsf11e35fq9o2sigb/52324133526.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b6cjm3cs7up7rub9r5aq1fdp2m/52632191014.pdfIn PDF document text
    • https://foulardfotografando.it/file/lovexaxitajorixeximozu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad954fd8ff0---zolepirovodoneno.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6bb0d2ba---kexipugow.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lanuxozuwigarowekavokoros.pdfIn PDF document text
    • http://cristalensi.com/public/File/63799692551.pdfIn PDF document text
    • http://dd-eng.com/files/files/50241283769.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/853f76f367425e51a5af845e23f93e1c/95727514135.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16fa42f0ba---xikobepodexibovofamapa.pdfIn PDF document text
    • https://isosklo.cz/uploads/61096804366.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9989bb2317---3560497645.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/akoms2k9c1hm7ta369sp9vtu55/50721228906.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/155369e417c010995655c84f15a72b3b/juzejusevabujelemukemizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fire+mage+spells+wowPDF 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_off00013a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 10456 bytes
SHA-256: 2e2c4c81d5af35714ea90d9c4459b1c11223700f766c1a3183ae4b181b08c14e
font_01_sfnt_off000151f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F9 17212 bytes
SHA-256: 6b2fead55570c0a617af9f4026f090b3809f7139e2e9c81dc5f661fd5fd3fd47
font_02_sfnt_off00017e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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