Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0453ec11175915…

MALICIOUS

PDF

86.1 KB Created: 2021-10-04 11:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 87957a85bf22b3d98221354c195e8618 SHA-1: 2372f8817f470b5008ddfd965a20643d65b9eba7 SHA-256: cc0453ec1117591546e0b1b2c43da2a77213568af6b59df827b682d5603c73e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unitec-egypt.net/userfiles/file/36461099248.pdf In PDF document text
    • https://mimpi1pusat.com/contents/files/maped.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e19214aa9665387cc8cad19a643a13f0/befewiduretonanewabowi.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/60793591373.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/memevokudilidarizixupi.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/72189836029.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/lirawarexonema.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/tefoxug.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109121954226839.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e2a869ec50a866f337eb12c09dc1d260/nijijezefuberazunotomaxa.pdfIn PDF document text
    • http://seamacros.com/upload/file/99359823055.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kknlaalv1po9shh8jdtaec00n0/nurajirewiziliz.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/66833097972.pdfIn PDF document text
    • https://rrhh.fronteraliving.com/imagenes/contenidos/files/72641689193.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/672016c9e53ee735449d30cf24151005/xowarogewumokegifigu.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/xamuminejadonur.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/b112ec48776e08098f5a7c8532cec544.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c20f5c5dc6---dofuxuvaf.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/pipakepixawizo.pdfIn PDF document text
    • http://eichler-kammerer.de/78327175505.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/julalozajedebebixidaseg.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/32784171243.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/wurusebonetuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+does+wet+feet+meanPDF 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_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 10460 bytes
SHA-256: 0f0192df9aa3e0fe8c13c1e64e12db7f1dd78218842357ee2981b18d0eff459d
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 18428 bytes
SHA-256: 3a918bb058b093e81cd7bc9e23a2a7f8fa031ec12978ac853a46cfbefa3725f4
font_02_sfnt_off00013298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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