Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3df87142e27a02…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 03:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0c58e12fb9bb9e06483bca104f41ea0 SHA-1: 4cbb8b9ec7a3099bee9b3885588a0f2604ef5c09 SHA-256: cd3df87142e27a024d1a43f42213fd0fb61f7763f250461ce221b0b2e0094b58
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, directing users to multiple external websites. The heuristics indicate that the PDF contains links to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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 http://haraj-alqunfudhah.com/userfiles/file/vejenifunoxizixawa.pdf In PDF document text
    • https://olterus.net/contents/files/25267539640.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/12914822869.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/34034923813.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/borewukogopi.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/54014494570.pdfIn PDF document text
    • http://15881588.com/ckupload/files/winutixibajo.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/bujum.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/zaxukaluduzewivifobe.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/tibowoluxudaj.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/65913659678.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161328404af117---60049723243.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-08/images/files/pareb.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6b18d3e50a88bcdbdeb34a3af193eaee/38111192817.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vakuloxazapififikoribiwe.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/paxarixoratijum.pdfIn PDF document text
    • https://bnovum.hu/downloads/32908052497.pdfIn PDF document text
    • https://buka.ru/sadm_files/22328831287.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/83666121167.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/fozajanasefajiwo.pdfIn PDF document text
    • http://calisnt.com/uploads/files/76559882405.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161365be2a50cd---liborarokotezojeruzeta.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/47216765226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jazz+piano+songbook+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 10580 bytes
SHA-256: 9035b612e27ed0ec383b7f1ca16338ff9806ea58106cd28a12ed63fb9a8d3e47
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 18636 bytes
SHA-256: e211745969b2981b85900d9a34e43ab306428b447c937e85fb7cc12268312588

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