Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd07858bb8c35915…

MALICIOUS

PDF

87.2 KB Created: 2021-09-15 21:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c976b58d58bccd50d5bab75d72689853 SHA-1: 80d13c79ffa4b6fe2aa89a61f5920947f306b162 SHA-256: dd07858bb8c35915eded301a17a4b2a0a4da42f5599a1e3551ff2279f1ea6992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. This suggests the document is likely part of a phishing or SEO manipulation campaign, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sanphamhanquocymy.com/uploads/files/17558392274.pdf In PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/34439457985.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/ziwodowolelelenaf.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/17922022820.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/wazejemap.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/gokosaramejo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dj4gjcduk3a3irfqmo9fqcio61/59675628405.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/20640642849.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/49439547718.pdfIn PDF document text
    • https://isleo.com/i_photos/file/vufabasexarelodotide.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/29563555749.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/pevugedoleguxexo.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/25094347578.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/vutawubozitamujupamiku.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/818928020.pdfIn PDF document text
    • http://innotack.com/userfiles/files/tebadilanisamud.pdfIn PDF document text
    • http://askort.pl/Upload/file/kobavatogozivofig.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0f2c9663---61672764782.pdfIn PDF document text
    • http://skupka23.ru/upload/m/13074901575.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137acf881315---litibusoliduxujup.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/filal.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/jokegikoxaweni.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///felaletidasuwexal.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/581ea1f6cb0353ba087c96f9aa4bbbef/dibasamavinizaxowelo.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/54884157751.pdfIn PDF document text
    • http://fullx.net/files/40986394308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+cartoon+animation+app+for+androidPDF 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_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 10788 bytes
SHA-256: 6759b6c72d3c1c9cb8a5302a29098d100ee893faea68f73aec5557e93707d5a8
font_02_sfnt_off00012172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 17540 bytes
SHA-256: 03c998214bb948aca8a41099539556d2dc95d9b9d1395aeb42cb187ce6212fea

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