Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c70e93f304044e2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 09:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c256bb866cbbc49807efc4bc670b643 SHA-1: 04bbef234b6fa1ca0098de25929b2fae6fed5571 SHA-256: 8c70e93f304044e2ab54a98023681310eb8c3cbd54ecd48d0e5587502955318d
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or SEO poisoning attempt to lure users to download malicious files. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/316f1de420370a3c21c8bd06b0a8379a/virasedowaxoxumilokulik.pdf In PDF document text
    • http://elitacasa.it/images/file/kidekatofo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7bee8640d---xiwagutaxazasisulitera.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/313b005d5f4afa6b91b4609bf8c1ad23/52247130358.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/wefiterozoworoje.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/majewizoxezosozuloxit.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/86494780242.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1ae0c4de90395e80adca954ef062be83/nubulufidosilagaj.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/duvigosikizudunu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8da6591e5---54964468116.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/mudapaki.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/90772541955.pdfIn PDF document text
    • https://retta-bg.com/userfiles/jaxasisilu.pdfIn PDF document text
    • http://stefani.cz/fck/file/21383300376.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/gumupekater.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/17398935657.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/50436612403.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021915149408772.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/terapelenixisevodenak.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/paxowuzifaxadoranumupomib.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/91508282161.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/likufera.pdfIn PDF document text
    • http://jiab.net/userData/board/file/gopejexizexijere.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/57430303277.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/92018880995.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/bawuvumaxenidedaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+trial+hack+downloadPDF 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_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 10576 bytes
SHA-256: a7f0810cfdc171b4c1ee98f1d6022abe34e8c51eebf20a00323095698ee29ce1
font_01_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 17752 bytes
SHA-256: a5ed7810f732e7c11848668ab0725247013e85a8f46c51614e3911a00de539a9
font_02_sfnt_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1