Malicious PDF — malware analysis report

Static analysis result for SHA-256 729f7661ea44af48…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 20:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 072f037a30e0c2dc013aa0610e5cfbf0 SHA-1: e7f62228e8bba8069c097ba55dd4bdbc3a1a57e6 SHA-256: 729f7661ea44af48d79424ce439a9640895bebbd29b111a5cb6e9b8345c2dab0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ilexgold.com/app/webroot/files/userfiles/files/59013523909.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/59574184126.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/xizujapumimamodulowezejud.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/95066833666.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/4593297908.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/xugikepoxikajimu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/76bilcrf9onjdigtd2ucqpdhme/reluvofoseg.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/97801111273.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/mogakupegapolulo.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/fuwiliwisaxido.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/69a2066655fbaa2aa8ebc59325bf17a5/39505728510.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/bubaripeketaxulimavawor.pdfIn PDF document text
    • http://gibisch.info/files/files/vedazalelofela.pdfIn PDF document text
    • https://tempegaring.com/contents/files/fubijux.pdfIn PDF document text
    • http://cmtsport.com/pliki/favumijazopovipavabagug.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/xitogujajadone.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5af80cfa16eb56513f43ffb827add204/wudasowenul.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/kepuvipivazuk.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/omosiaomn0ff2rlclf0p4u9i78/naxonekupibino.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7bff05ccc7d26627f3f275eeb538f7f6/97255102679.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/9509109824.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607790cf99719---dogewo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/350c245a7c1c7ea0d3a85f43dedeebbf/45269319182.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/71936613562.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d49bb4f2f84---59388548946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=colossus+from+deadpoolPDF 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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 19132 bytes
SHA-256: cfdbdc4cf812ebff8cc0a2d1d7d437be103a23d82b315219fb8a87256a47ef33
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 10496 bytes
SHA-256: 34e176b3fe0807ba782623b46c49f2635a477f2fa80428b07ad53b1be92ea5d9