Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dea71de908a263…

MALICIOUS

PDF

90.0 KB Created: 2021-06-25 22:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 549dcc1d18563a2f258dca7e28fb00d3 SHA-1: e80e32b221edf44387963f593a8f5c445a26924b SHA-256: 58dea71de908a2634b09e1efa773786c3d7052c919db054841d04b43a4a72ddd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=unknown+flying+object PDF link annotation
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/49aa9024c3744096d56938eda84d2c2c/92258666209.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6771279a0d---39961219581.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/fisapenilim.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608be38c3887f---padapawu.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/99455772966.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7dac9a22975058602aac3b531939154a/xavubi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce269468e3---97938681959.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c04afedd---82529559391.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a25e2dc6cc2a88efe3f663d2249bde2e/mitinitusamalefusul.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/roxuxomarip.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kiwisedimexum.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ea0f1985---18851903731.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/87668559917.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/nemibodifutegirisorotepa.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3e85fd2415a265810447fdcc298202ba/51104699678.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609993f92ebb8---92913910501.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///39151655455.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/78476066292.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/fasazesisaxom.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d9308996---nabetusirefirunaloni.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dikumularuze.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/xepujadiko.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/69597538788.pdfIn PDF document text
    • 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_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 10648 bytes
SHA-256: 52fcce93face82dd690d54c01c107c9fe5791220657c6416fb29b1cbaa97effd
font_02_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 18928 bytes
SHA-256: e08d22f86e5d1988d20f82b25e09263b9c4a5f9d21c8f7f83c888b91767b094f

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