Malicious PDF — malware analysis report

Static analysis result for SHA-256 50acf49d42e23a17…

MALICIOUS

PDF

72.2 KB Created: 2021-09-09 04:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4a912f1606b3c3b5d5566fd5854183d SHA-1: 0f1a54dcc9a82f593d69a6ca94db5cdca0c6e99d SHA-256: 50acf49d42e23a1790130dc38802ec57344eb26a09c437f34ed7d2b98b5a2abc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161350fdd1f875---75517679495.pdf In PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/48833167908.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320a8b339ef---18222941645.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/kumavedutolisatomamalanel.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/fuwoso.pdfIn PDF document text
    • http://namngonviet.com/user-/files/99414402139.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/436273bcd5cd8d35ceab51f65efe710f/vunava.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/jetet.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/30667865054.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/lobelitasevomirokizapogi.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/36170696984.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/rizoxatow.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/88407461167.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369bc31856b---38831153880.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/37056895229.pdfIn PDF document text
    • http://scarpatti.com/files/56704428543.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/15596212146.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/92594566126.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/jinoxokolemajewegazugu.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/vesudogegomabawokanigexu.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/35175229166.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/pibutigeginigodututowizoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sweet+snap+lite+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_off0000b69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69B 10276 bytes
SHA-256: 98d5d0500b9ef32acbbfe688789e603b3a29e7f4346b4ab52c536bbb1694feb0
font_01_sfnt_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 17516 bytes
SHA-256: 1f995b295e9147a97777c4919769f75464d653fc8e6170e32e5c6e67d3694fb9
font_02_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1