Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1a8212a34fb41d…

MALICIOUS

PDF

74.1 KB Created: 2021-06-25 16:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1ca8193b4fdeb3f45616145ce84d5f83 SHA-1: 28b52cd3f91dd0efaeba0139f16cb806eb37cefa SHA-256: bb1a8212a34fb41d1587c9327a8938a64144ae9409458af827b5e4e310a6c1ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several heuristics indicating a link farm structure and pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm nature implies an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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 http://songhakbbq.com/uploads/files/nixunutosuwikawewenor.pdf In PDF document text
    • https://coastalstudio.com/images/main/file/dovaf.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b1b3c85d---31289221501.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071aecfe850d---27506041873.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/fuzemisikiwikuziwewemoxew.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af901809767---donenetul.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5240616225dd915022e60be10470031c/16903969584.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/5057925917.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/56493062556.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/51481840043.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb787e0b29---kawigovexilex.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f1ffce41292aa1b00610692fc2f8ea7b/71242744629.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071984583806---sarevunap.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8d452f1f---34808827406.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/7298880950.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/980550184f4ea158c5848e0771e41f91/22754579619.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/18174345268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=online+movie+watch+bollywood+latestPDF 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_off0000bef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF8 10964 bytes
SHA-256: ef0da7c5939f9fba46b9186de6f3984176f81dcd8c166c66e165a3568453b309
font_01_sfnt_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 16620 bytes
SHA-256: a40870927b9dd418101a8b9f5730f53293aae915691c222edd8f581f99c09cfa