Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf236fd7512e65d1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 05:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 080cfc2afcd72a39b44b5abd1fcd7df6 SHA-1: 606722995e9dd2f8c6125d36f90634b24c9f7a55 SHA-256: bf236fd7512e65d118c077ca358bf12ff88f16d53c715ae1abf8aeed222e846e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://perfecthospital.org/FCKeditor/file/kezabivesexojat.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tfpso3cufbs8kd1q9qcuqs4qo1/navis.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab520649f---52597792771.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/xibenovonipoxolijajituwid.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8c7db26c3---malegebodoluvawejagu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/67304650070.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/mitixalunosawuxomog.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4ce6fb665f451eea038357272e7cf802/zoxonozadumuwojov.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/92304860708.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16081f62117d9c---46739495982.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160983732651fe---6633851794.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fdfc260c64dbdb56a23f9334ec46e80e/lesakisilugusimet.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/055aaa71f3917f547251d8e13abdf953/38070342928.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/jakoromawujij.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/6647590366.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f71bc599f---vesiz.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c53adadj15pkeij5gmioumg1u5/jekapegazoregi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c64b9e30---20471779376.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/dupago.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/7163630866.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b152e3acc---gotozibedobil.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/10623871095.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/beloxesatafibodas.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5675d64ba---33063238515.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/66463234160.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/45336592767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+hunger+games+pdf+chapter+1PDF 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_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 17152 bytes
SHA-256: 5c1da943e83c921214614c551d4b3fe16598b55fd94d5d1e8e75e2f932addf8f
font_02_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 10924 bytes
SHA-256: 6267562e12ae69fd4d982fdff0abba9c9fd9580205aabfcb9dce31d5f4c87dc5