Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eaa52b5ccf468b…

MALICIOUS

PDF

82.9 KB Created: 2021-07-16 16:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9751f40dcfc80e22cf12890fd4b8dae2 SHA-1: 60c61750c74b790d7500bc2d26d586735087be26 SHA-256: d5eaa52b5ccf468b22a8aae3b9fea90229dde2bcb31b178d83bf17b91f8fdb6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure itself are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=how+many+ounces+are+in+4+cups+of+water PDF link annotation
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4a35c4e6e1260e82f8c710a9062f3731/robutuzopuritiwawam.pdfIn PDF document text
    • https://proxus.nl/file/80161999676.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/kukunodedejotozib.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/kajuxo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qgcga5llktd8bdnr6vm6gfki75/jadufaxidezalufetide.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/27984493179.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcece59abd---4333580780.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/45634564493.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/pobixiwuvusok.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d8effo3oejg7mupgidhbe0h9q7/3617389284.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/felilirodakurerezibunab.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9b3e6587---laboledumoliso.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/likhd2mcb84kcm05i6j50o8bd7/mesopikasuzedoxonugaja.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/68555020729.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/wavigijiviwokoj.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/beroxufegobakozi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/it5n2sd5hscluquvca5nr9v397/13415568947.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/57020167081.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pavisifuwezizokupuwal.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/43936196440.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/wuteke.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/titaralugolugawovavufutox.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b64c86026b7---41615183768.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/11491313489.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_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 16712 bytes
SHA-256: af1be7e404d1cf99a4865a1587d40743fedb4b9c12a8327a3f0e2ae53ebf1b95
font_01_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 10964 bytes
SHA-256: 4b702e5c7d3cf9a4db64534a1ff3be19d900371aa922a2410f6c2438c5ecac24
font_02_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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