Malicious PDF — malware analysis report

Static analysis result for SHA-256 f715cefbcf572a55…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 13:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4929c7575bc902d03a7dd766454e33e SHA-1: 48ccd6fb407c12d83e4faca2a353686569932ea6 SHA-256: f715cefbcf572a55e17c9c7e61a264f77fd011d68ea2e96c8dffe747f9d821f9
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to host malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://panificioilcavaliere.it/userfiles/files/93645921072.pdf
    • https://vnsteeldetailing.com/UserFiles/files/jodeganevowewima.pdf
    • http://fosterfreezesantarosa.com/uploads/files/40800885249.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/38409623881.pdf
    • http://aktifithalat.com/resimlerfiles/sudoneno.pdf
    • http://sciattella.net/images/file/difudalananije.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/64556595366.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/wikifofilibibena.pdf
    • http://ronaldtan.nl/images/photo/nisimi.pdf
    • http://itps-group.com/uploadfiles/file/15160607796.pdf
    • http://edu-soft.ru/site/htmlimages/file/tafowidalorelarobotex.pdf
    • http://arucax.am/user_images/file/kumununivazorob.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zuwidiwezorapam.pdf
    • http://tele-klass.ru/i/upload/files/25563242138.pdf
    • http://taispacedesign.com/upload/files/mobidudisisijuked.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/bupikanebavepur.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cf43bbf21b51c15fabf069b568179445/gorononugebaj.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4hobtp09o39d5i0ib6ref2h817/49078570375.pdf
    • https://vnjhanoi.com/upload/files/86198073604.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/dakuganuzawowixumomonitan.pdf
    • http://xn--j1aii.su/userfiles/file/loregasobiberuwak.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bab16ec058---xemamoleloxibegile.pdf
    • http://filipdegreef.be/uploads/files/60650328548.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae7c524ee7---54058331150.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363a874bdf9---datonarekijar.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=descargar+pokemon+heart+gold+para+android+en+espa%C3%B1ol
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF57 16792 bytes
font_01_sfnt_off0000d76e.bin
eebd633ddf5b82fb4c8c54c47786feec318204f48faf2ddbe0e65a29b7aa3d06
pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 11260 bytes
font_02_sfnt_off0000f12f.bin
4bfabef97b29cf26425c6ae64416b05a085237909e193c906c5961df823d127e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 18064 bytes