Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d3385ecc955296…

MALICIOUS

PDF

133.3 KB Created: 2021-06-23 05:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 14e58c26d01e38f38d416438b156e633 SHA-1: 3e353fc604617ba73d0c0cce95d8ec9ad16fb71f SHA-256: e8d3385ecc955296dbb24d1feed8db6b1c515cb420b8f456d2a55a95761cb67a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains a reference to 'Precure all stars new stage 1', likely used as a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/q6npe5of49v8b44980dq322ud1/xuvesefajupekabapepix.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b05b13538---xilekonopil.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61deeefef---xarudojepisatejazofezibin.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/88f28cfc418f45b6dc38d4a88ba1cb80/vugumavuxena.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/36787687181.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0960b1e1b49212f985234e609753ee94/gizelonozasifukol.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091d05e89579---jubefusut.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/fejuzizavodaverunekaxofa.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/15964866928.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/20208256755.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/zujej.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16088522934e12---73918338963.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/48d4dc2c0b11871419b6a0df2854da4b/dimizaxebujetowog.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/868dd4af9b0702f6b055909488b1b163/jebiruboverabaritupedek.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1a46b31b19199e0c5d4735fc0cffef1c/78023671607.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=precure+all+stars+new+stage+1PDF 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://scripts.sil.org/OFLIn 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_off00013e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E52 39704 bytes
SHA-256: 16cd8fe435acb9233ef24336e00ada62d48cb035fce001d7f522f1e198b5e281
font_01_sfnt_off0001b98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B98D 5112 bytes
SHA-256: 5c3f860733fdbd043c391d86bbe67292fae794ef601d087509971ea1169725af
font_02_sfnt_off0001cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB17 11784 bytes
SHA-256: d57e4b2aed6a4fe6a05703a71b0efb98f505b546927507abf7f1f2022650af61
font_03_sfnt_off0001f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1E2 16308 bytes
SHA-256: 85afdcf12004a6dd10c03d7dd3c262ddaee20cab1ad746c93f8aa299df1354eb

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