Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4128935b3ed281…

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 18:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3f1d7d928bc455b2166e6ac3df95814 SHA-1: a4a208a11e85a2278509241f077e163e7d9fb81b SHA-256: 7b4128935b3ed281d89ae917ec2114961f032bb963dc89b0f1267a0c7dd0c1f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised CMS upload storage and disposable hosting. The URLs suggest a lure related to downloading hacking tools, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://strandedtattoo.net/file/9094395300.pdf In PDF document text
    • http://www.77ice.com/upload/files/takajipa.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/lupebo.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/7456740673.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/70061138670.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395eca88cce---pelanudegedadavekuk.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/bezujedoluraz.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/30250625284.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/40828738085.pdfIn PDF document text
    • http://glttek.com/userfiles/file/99666989939.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/ziwalekapifamiximo.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/sefijipetamuzikikujabe.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/vodufaxunuxubigim.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/katawilabuwuvetojizopagu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f88b6ab8975b8cdd7f7366391f37456e/77010791756.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902074932.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/12100006191.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/vikevakutirus.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/64864821520.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903002514_b950uj.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/48029764663.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eff339ebd5a6f94c4a446cd46859043a/73795195824.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f43f87d23---vejigumubumadigufu.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/luzajibulezerafogimijigor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+hack+wifiPDF 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_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 14660 bytes
SHA-256: 6560f418763fa787d8083dd7ccc2551a8622c634c57da8c5ecb75871ffb31d01
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 10256 bytes
SHA-256: 580889d1261bed61cd72406f641324e2270e49ed6dbf47043a51589b078d3ce8

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