Malicious PDF — malware analysis report

Static analysis result for SHA-256 182efc708f3d30c9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 02:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4004855bdc210eb969d0f7864db1b551 SHA-1: 7a6728f77a77b9981e33ef4ce3636ddb1eec9ee2 SHA-256: 182efc708f3d30c9ab31616952978822399803cf1478225073a75aa2c4401202
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on compromised websites, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=how+to+get+deleted+apps+in+android PDF link annotation
    • http://wahluenfty.com/userfiles/navebokipozige.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/dopagovibemonumagi.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/74430329315.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/4423377222.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/slvrr99otples1n8bdp0q3nqsj/42403482328.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/85549772968.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tikuwimitezidule.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/83608438240.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea09f319d---lafafekekefokewadugibelo.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/44669984857.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/64038445687.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed02fbc09e---fifopa.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/sejoketajukog.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/82309315222.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/nofelasulovezuwezavaxesig.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/38599405411.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/28198297673.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/82614465393.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/nilixofebitodijuti.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/91965594786.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bipomotutigifarunimuxozi.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/44513944295.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/15323235728.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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 10644 bytes
SHA-256: 53fd17efaafd2cfb223da152d8e709a0211aaca181743f83d0bc0515cbf888d0
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 18052 bytes
SHA-256: 2827368c9808631c396493692664bf8fa30dc0191bdc53b3f000491e21572637
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1