Malicious PDF — malware analysis report

Static analysis result for SHA-256 2873e731b9a0709a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-01 06:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6abe6463e9f74c97ab25dfb6d41c5d94 SHA-1: 31eed098a5d96317df7c41864b6da1dff31998a3 SHA-256: 2873e731b9a0709a6396520fd1e4c5c0f960aeebbb824b136d84413dc7557e9b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it likely contains a screenshot designed to trick users into clicking a link. Multiple URLs pointing to compromised CMS uploads and disposable hosting are present, suggesting a distribution mechanism for further malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://micast.de/wp-content/plugins/super-forms/uploads/php/files/qc8te6ntkl0vg4q8vuorlcjj4u/lopofasow.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5f7dac6739cb3d9c2d2fb46d0947f7c7/tonabaxokefofejuworuvolum.pdfIn PDF document text
    • https://iwistw.com/upload/files/71659185651.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/72760894231.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/24147040284.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/6687512943.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/jevomirebumetopenop.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/09baedb36c0aeb27d506630b3b457215/97578213668.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/tewolisofiba.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/duzuwiziwoxale.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f0c3b7b7cfa8bb72b9cbee9147d27b1a/68113328188.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/77522889066.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dce27b8f9a8---xasugixevurubeguneredukeg.pdfIn PDF document text
    • http://otohonda-phutho.com/upload/files/rawegitasadebemufuneven.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725888408b7---letode.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bdf99095f185538f245686a1c29d1cda/57329775885.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/4585455905.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4cdd3e5f---mumijutotonokowo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a1829a89---zujaririkefofebixesejugav.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/ziwabakid.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/dbe728440d16a2ea67f0441a86c5656a/foralesazawafi.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/xagamisevo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cbcb8a5b18e0fb305c5b004790dc971b/53462403747.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fa9bbf863e1aeca30ee86274e3f9f622/71339797019.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/zawinotixunikexaxeloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=subnet+available+ip+addressesPDF 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_off0000b8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 10648 bytes
SHA-256: b3d779bb6fe36b7ef2cf7c8d0ad39b447d2f212b8ed494a9e8dfbd480ed4013b
font_02_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 13280 bytes
SHA-256: 998fee101c113c95be06d5c44211eda99e98901d2657603dc9fda05cacb62904