Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5c16016ce61f94…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 13:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2ba3fa996d449e384e56f1e481a2af8 SHA-1: 943351462d49fc69a896c736fb5707ae150c63db SHA-256: 6f5c16016ce61f946fa234ed2d9f79c33bf5545df15d96dfbe0dfa5a2050b417
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate this JavaScript is used to redirect users to external URLs, likely for phishing or to download further payloads. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://adepotcustom.com/UploadFiles/file/20210917161831186.pdf In PDF document text
    • http://bukhatirhomes.com/userfiles/file/wamunisamiki.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65250fba2---banapezalomudabikironed.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140298fac9c1---todajalubidutodisubox.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/41135807498.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/87187748300.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c971bbccf6185f3695a93dc0e9f8db15/64332853789.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/kamofefo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/90999993352.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/23850597018.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/63930657110.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210904205933.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/15620932564.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/gusebimupafoberuwaxepi.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021910205232369.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7d8aaaf4---76595449571.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/2243263286.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/webusadimofeviponebixel.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/23922340999.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/fojewepapaborerudadipulun.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/2722315177.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/jolisubexopewatamatazemib.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/11732511048.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaee62ae45---79734089542.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/67459203663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=truck+driving+game+apkPDF 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_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 16556 bytes
SHA-256: 180f2620280c360ec155c442eb171e16a7117234fd93ce17eb8554e66805b2ed
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10648 bytes
SHA-256: ea88ce3706b0efb566c1b37292a6c7dfff179162559675cba49f6301b7394285

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