Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f653ea7484dc06…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 22:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e921d31bfc1cea68ea7682872296f845 SHA-1: 31c380aad2bd30445310edcff90b005a085ef4c8 SHA-256: 52f653ea7484dc06f99aa6ef1920a4c02d91b888572582092a1149013a3c86f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The file's structure and the nature of the embedded links strongly indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132091da0b31---favipaxujevud.pdf In PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210903134603.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_051269673D293BC6.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37813642373.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sutomabomujetolekar.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/tenusupunusu.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/taneku.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/zalitedem.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/lugowaxumi.pdfIn PDF document text
    • https://kawanmto.net/contents/files/56515656064.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/veximurokuxerun.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/pedijiwitonoliwi.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/mesitulobebusewimew.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161358a23137b9---45778086884.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/5220111351.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/47598164216.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/batoge.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161418447be2f2---zevuregifaruwakoka.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/vagawijowedukonivoziko.pdfIn PDF document text
    • http://esistore.com/userfiles/file/kapudabinidekug.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/30524834120.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/23775739003.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/gelomateduzamipabomugile.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/puropopiros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+check+my+itunes+gift+card+balancePDF 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_off0000baf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 11444 bytes
SHA-256: 0d199e149f5b50fb506b4134d00b3ee4f3fae0956e06333eadcb994fd3c79e7d
font_02_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 16288 bytes
SHA-256: 1ec6a3db8cf986191259881fb5b4b1eae20fa13d415c4f731ea1e97aeda285fa