Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88ed2b2a51f4771…

MALICIOUS

PDF

55.9 KB Created: 2021-09-03 18:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f5b92d7b5e7c75254778b02b3e99fc7 SHA-1: ad9a6eb92ce55272776a7754844f76273248c70a SHA-256: c88ed2b2a51f477179ae8264ec7ccb337afdc4fd2460bf0add043520a7f4ca69
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the use of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6632

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=neonatal+alloimmune+thrombocytopenia+pdf PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e008f95f7f---1827951377.pdfIn PDF document text
    • http://ipllaser.in/uploads/tikopetokimuwimi.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/83217835741.pdfIn PDF document text
    • https://hinaweb.com/upload/file/50781966662.pdfIn PDF document text
    • http://someteme.com/archivos/_20210817052639.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/30697580230.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/fevimipujotebugotipap.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6af235d03a6564e5f768ae73abba4860/zavewizojojefuwunar.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2f8cd218a35734aab12d591e53f78ec6/64303062031.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/39740710496.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/45a7bcae4afa2ffc4f4fb7cf50c32a07/10043840080.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b4033381c69---24516540777.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/gidugetud.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/l8bdd1vajtpe1p9a82os3shic7/53745969409.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a24c824392252c0f7cb0627cbff4fd1a/mivukikekowud.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/94158829161.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c574980cd2cbc46cd0d371785bde3b62/sojadufemenexafonageba.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88587b68b0---motexumun.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/87597115457.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2c22c6c9---45541586997.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e38b7c47fad---97124935481.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/55245331170.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6cb42dbc4e96ed7db641d5c75cff7e8e/33109487574.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f699208b---50821285297.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/homrsvfmth4u06vh2ifeeoo2p5/sanisoletepoga.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c756940de33---41983626033.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18F 11048 bytes
SHA-256: 9688fbec94d6ca75e5e30bc9beaf73baa4f783040e1e795f157a8dea983134a7