Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8ca33f45d8307b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-06 00:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93282308a666bf22034a30a1089584e3 SHA-1: 04bbf200f12dea28579b0a07503b696c8c930f6b SHA-256: 2f8ca33f45d8307be6400e19aad72bfc3af0a5136dd92c0ed61562b47bae4977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious sites, possibly for phishing or malware delivery.

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://esipro.fr/userfiles/file/xekidasukafemerajubonibok.pdf In PDF document text
    • http://tpdw.pl/userfiles/file/vozuponekudojom.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/93017008036.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/guwuv.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/mamenobejumajerinexivom.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v4sem4cpbs19od7q61eje2rju2/torim.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/da77a55416035808fe49219467045ef6/jenevagovuxurigexebu.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2c1b91cf30e79324817e1005e9f205c9/29615786496.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/67045766969.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/6494423521.pdfIn PDF document text
    • https://theurbanthinktank.com/files/javunesujimese.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fae1d5b42af---dututa.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/vatugodizovunakelededik.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/cr3m64g90vfgldk1niolcuhr8v/mikemusetufujajetaxij.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/8032673817.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050517432389.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/masufili.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/la9b108mur6jn33n61ce6ek1b2/mogonilutikeguf.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/61980152794.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/munovuxiwixixixatabemedo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fc76424bd832908b29617710275a861b/davogavawabazafu.pdfIn PDF document text
    • https://badrivishal.com/media/potesapefajadu.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/39819866337.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/37203458393.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/xataridovabunenilufuvozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=honeywell+wifi+thermostat+rth6500wf+manualPDF 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_off0000b7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D3 11192 bytes
SHA-256: 0c2f5fd8fdc16ae33218f4ebd634182f2dfdfa730ab75982c019049c83a9f8b8
font_01_sfnt_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 15404 bytes
SHA-256: ee32b3a2e7984499231e10ddf61d46ce87ea36f8b1681774aa4eba492101028a
font_02_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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