Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61a3eb0f60a7462…

MALICIOUS

PDF

115.4 KB Created: 2021-06-26 16:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c939543c08c54b467f8c8be3e16391b8 SHA-1: 5190cb1614fbd8464b2ed587409ce7de9954d0d9 SHA-256: d61a3eb0f60a746288acb0aec0b976ed0107854bdc406663fb06ac0e5ed83acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://camwater.org/media/files/dapepamejosuwam.pdf In PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/54088214245.pdfIn PDF document text
    • https://ahha.az/userfiles/file/78504137893.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/99113838446.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/72655136188.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/fewapisepudinudali.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/sobij.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a92cb41743e7fbf0f2b55345b3d1daf1/jajivosizegijefaxotaturo.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1622264384.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/jurenifugumivipitamufobaw.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e436b130c3---welodolup.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b159f454a4---gefavatomeruzuk.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7v95curc2scje1jgc7sa5pbfpd/gewivexanojogeguvofidam.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0766dddb16---nezekirevenolixu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/a88aeb57nbjje4m28cmp95lm4v/sezizudedonivisupi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bphgg6q9njh22sfm9rdi8c15m0/34725847780.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4e0cb70c---55209464279.pdfIn PDF document text
    • http://texmet.pl/userimages/file/dekegadet.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7b471b4f8c10654c51d8bede1a25149b/38441385254.pdfIn PDF document text
    • http://93564497.com/userfiles/jukuxisebifow.pdfIn PDF document text
    • http://short-story.ru/upload/file/remiratudiwefugokaxuxa.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f10e3cee6d3f8cf633cd4b63a6157594/lufizog.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a39145edf60---64063765302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mexican+giant+horsetailPDF 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_off00015e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4E 19768 bytes
SHA-256: f4ac788196aa870791d2fda581f5bf51999decee346ad2d9c1e5f1b2964aa956
font_01_sfnt_off00019034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19034 10604 bytes
SHA-256: eeabe00b6d6a1b2d05276c0aba49c3ec1a082087673d5bb22f8f7a9d55bf6de9
font_02_sfnt_off0001a86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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