Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d27a857073406c…

MALICIOUS

PDF

81.8 KB Created: 2021-08-26 09:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f001438e623c868fd58799cafc5562f2 SHA-1: 8d50dce40de4b339b4d3ae62cf6b273ddae112af SHA-256: 39d27a857073406cb519703abd116b259d034bfa3909b057c42c3a0fe90e0670
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The PDF contains a link farm pointing to numerous external URLs, several of which are hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/wixuxikig.pdf In PDF document text
    • http://huucodatlanh.com/userfiles/file/zereje.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/74581179047.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/36525744200.pdfIn PDF document text
    • https://chp-travel.ir/data/file/30824005793.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/97485021197.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/oqpbi8fcnd6orsv4vucod0ln05/51331535352.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca8a95b940---vewop.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608951c2e93b9---zatonevemuvutuw.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/usafg2jrq94qo5sg8s6ak2i5b1/gizepawijewisinafeperon.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609255afb14b6---sepafazekefugobenag.pdfIn PDF document text
    • http://c-amc.com/upload/files/69695568235.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/73780171640.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160779f1256528---64490861946.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/3886206066.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/51302179114.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/l58ph0b0d27jabvf0krisirr52/guxixelujowufewalotawesa.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/60043730140.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0613045e7d---65486995887.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/matoku.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/21082241262.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/lededepukaxuferu.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/xovif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manchester+nh+mall+storesPDF 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_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 17460 bytes
SHA-256: 3a76e7e42599879d7d04db2cdb15b631412be9ee07a371450085b79ca2a49181
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 10396 bytes
SHA-256: 0b01bc0890e1967646f7c855e987248d81bee3fbe6ec90829de01ccb56949bb1
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1