Malicious PDF — malware analysis report

Static analysis result for SHA-256 073f5e526ed39aa4…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 12:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f23b586ab033b351dad54ffe2c93595 SHA-1: 659952a813b93a97a3d4ebc75ce4571bd59b3f17 SHA-256: 073f5e526ed39aa4243edb17c9da823cd13299b6a94dbe9ab9ee4fbbda2fcf30
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely executes malicious code, and the link farm attempts to redirect users to external, potentially malicious sites. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://grandviewgroupresort.com/upload/files/15584664971.pdf In PDF document text
    • http://www.amedna.com/userfiles/files/tuninuridofadikaponuso.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/53710201912.pdfIn PDF document text
    • http://snft.ro/media/file/vozawipakemujo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615214fd76a40---72107368050.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/jokebujomejajapojejakotul.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/58642125219.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/48650417659.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/30088707337.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/witibijobutajexa.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/88474416095.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/gupojafeba.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sejezukarewawotitaxiwuzor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa2d9915d---13676363919.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/boberojaduf.pdfIn PDF document text
    • http://nktrading.qa/file/files/83575140896.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/tatewapujizuwipi.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/jujagimudoji.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/88943133730.pdfIn PDF document text
    • https://beylikduzutabelaci.com/userfiles/file/66944682357.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210909222738_8epwt8.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142abd0b8658---91866858706.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/xavuwupusipegekati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=como+habilitar+o+android+para+servi%C3%A7os+de+dadosPDF 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_off0000b099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AB 17860 bytes
SHA-256: 7f0f9b5c37cbfa3217ad6aa1c06146673082d54283254c2b97c815fa4d251d0a
font_02_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 11092 bytes
SHA-256: b8159bd5b4e2b143ddf3e7cafb8aa669acef90df4933721086050bf0468f932f