Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03bc935eb9a78a7…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 01:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32620cf8519d7b9a104c84ebf11dac48 SHA-1: 27727d0a545133c1f8838bbe8e64637920d1aa25 SHA-256: e03bc935eb9a78a7ec33ee8d5bea2a9ca1ba1699d3e8e73b667a4f38ec55133d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://3e3i.com/UserFiles/file///wevime.pdf In PDF document text
    • https://keluargamimpi.com/contents/files/39229041444.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/javawo.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/75300081780.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/tozemunumo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tipijasojukiwafotomonuma.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210907_130105.pdfPDF link annotation
    • http://guss-ex.de/uploads/fck/file/sitejawuramored.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/2628637074.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/8322237535.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/badozudi.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/58624492267.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613556f53470e---jexikukarezekugilo.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/xonabudogex.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/47521959354.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/pidogalirokadanenofetaku.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/lotedakegujid.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/nenegujojusaleki.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/26463346241.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/2785352125.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/93761236769.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/xubemoge.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd7783eec---bolobokadetidebum.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3fc467615bafe6a24b6c9d7fabb7c820/jonesufelodosafone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=vanguard+bandits+isoPDF 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_off0000cbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 19372 bytes
SHA-256: 1045b52936711d1dc5777442726faa861c2ff42573b9bfc986ca441b82ef3279
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 10456 bytes
SHA-256: 898500ccad8f987367b83e8a30c9302cf25185fd9871c7cf831ae0efa9be6d45

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