Malicious PDF — malware analysis report

Static analysis result for SHA-256 053496f165829859…

MALICIOUS

PDF

71.4 KB Created: 2021-07-07 06:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d56d6d903ecd529b85702320eddc5ad0 SHA-1: 3f3c63f2aa12c91e142da7ebe0ddf935052f0bdc SHA-256: 053496f1658298594bc52b09023f21892dbb4e1d286d5ac79f0a9f593c214501
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zlatartopalovic.rs//files/bivukililupusuxuzude.pdf In PDF document text
    • http://thankschicken.com/uploads/files/46400647845.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5c871b81---bixagifetopuzirekitoxolug.pdfIn PDF document text
    • http://billsky.ee/files/file/87417920739.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/42777064193.pdfIn PDF document text
    • http://envigest.cz/upload/file/85606166637.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9fadcfac862b184acfacf38612a31ce6/15784105656.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927bc879bee---sulesatogadan.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3e58244a5d7703bc6a704c82a42a7922/82641811195.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/35665348505.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a6883121---9167095076.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/97939994657.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/91693165848.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/11896212169.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/aaaac9733b43172369e9847723b6d466/bakogojozezijaxigek.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff6b99884---94615662791.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084982c295b6---35581106569.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8816d575af---6999610817.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/55369006030.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b2ddc836946ea913f4437a93734e14c0/993247704.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca7b24d96---80214718475.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/dusovawogas.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebee35354---xajeliloruwitezabulivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gc+nuts+and+confectioneryPDF 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_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 15804 bytes
SHA-256: ce6fed88ff734902d3cfd42dac7f25894f088328bc4db74a960deb6ccfc32a35
font_01_sfnt_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 10676 bytes
SHA-256: 230d06641ae2c973c30539ef7a9f3b80faf536f54901164719e94343f7c1872c

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