Malicious PDF — malware analysis report

Static analysis result for SHA-256 945a23683635a99d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 00:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe7b7c0a61a1adebee6e633f3d5de57c SHA-1: 5ab253818be48349d5c0b1f53b5629d3cdb9611e SHA-256: 945a23683635a99d0bb24941fd2f976d85d5eff05badd20ee5fb0a0da1df3008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, some of which are hosted on compromised CMS upload directories, suggesting a phishing or redirection scheme. The presence of multiple external URIs and link farms points towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pokorny-podlahy.cz/UserFiles/File/28633330483.pdf In PDF document text
    • http://allamericannursing.com/userfiles/file/mujobolawowagatekolipag.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d552faa9df---61273657619.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/latelidulovugatikam.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901135619755664.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/52531159230.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/19831604892.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/41299074976.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/gusugumibagasisebin.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/68609529482.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/68310625128.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/79271030545.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0962938b1b5974113770fe257b7074f2/jotalum.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/mobekekuvenapetewiliz.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/45939696175.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/28960037591.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/30564279104.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/wanuvefirulilasixuper.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/zivosafatapigukuza.pdfIn PDF document text
    • https://estoniapools.com/contents/files/puluzefatazugajutenofel.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613052dd41a1f---25264543300.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/jujelezoposaxitogisudif.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/fupevelisedegawabex.pdfIn PDF document text
    • http://dasbluemchen.com/vodejedogevujikibaxodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+cave+house+designsPDF 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_off0000b788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB788 10868 bytes
SHA-256: f9fd83b3ee241db84160c1922eb39deed756c770ff503f5a931bffc4775e1390
font_01_sfnt_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 16132 bytes
SHA-256: 8f26a57b008f67cd12289ebd9aec21d877f9eb7bce35b32c02b363f471be89df

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