Malicious PDF — malware analysis report

Static analysis result for SHA-256 4662859d365e598d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 19:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 542e47f5215820a3b18d9fc0474e44fb SHA-1: c6b194ca3cd2749c6b1eddac388d2550bf22cfc2 SHA-256: 4662859d365e598d64e7bb9dc8b68d3d91c7b188951907c57d0f153c6bcd8e4b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://rpsbchamber.org/editorData/file/mefefadizavumamoferol.pdf In PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/bodedivefaka.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/nidetiduzirizexidodibuju.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/a00b727cf7778d25f46625f97c3edc81/vijabiwasavawujo.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/8937368188.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/31514125532.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/71662403240.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/934156172.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/mojizeb.pdfIn PDF document text
    • http://levotst.com/uploads/files/negamekif.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/35525495755.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/mapawaxilufulik.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/bejale.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/daxupixozabawatarugufe.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/32370040845.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/gikoja.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132388ff14a6.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e00c92c187306c93c4925939084fe341/86551908128.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614015a155d45---35597876824.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/zegiwunarofamod.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/22592749606.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210914071729.pdfIn PDF document text
    • http://castel.lu/userfiles/files/xofuvitebitukilodifan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=you+make+me+feel+special+quotesPDF 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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 17892 bytes
SHA-256: 20204ef6efd3d74d1c43f651c2c7e7b13fe181646a1474c215fc25b0e5261f59
font_01_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 10756 bytes
SHA-256: 80bdc2e7e991dbe0d9429fe3eb0459b4e6d4587ef21f81d96b2a30359bfdbbfc
font_02_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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