Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ca6867ef78414a…

MALICIOUS

PDF

78.1 KB Created: 2021-07-23 19:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1478489bb7f97cc519ccc5776f6ba201 SHA-1: 1026451b58c197700b2c0289bb57b5f1388d555e SHA-256: 19ca6867ef78414ab53aeeeb10de68531d6c756282315c15cad534d4d1a02fb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The presence of numerous links on disposable hosting suggests an attempt to obscure the ultimate malicious destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pjkconstruction.ca/images/file/87949835731.pdf In PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/95594223900.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ina38rel9aqj39dtl0ogs4kam5/2215641941.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685e814c65---81840226103.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098439cd05f1---9801491088.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7f087029a035bdedc4f9e863c150f124/97003980997.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/93800126644.pdfIn PDF document text
    • https://wagaskar.com/media/gurenozokiwejopu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/10bccdf64d4e05fc479eae34f69d0f6b/rovuwigilidukudipe.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e196ff2d60---givusibupufix.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd21a71f4ba---59228500249.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aomc95frdbd83iqtrk1n7qrpb6/luwib.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/fanogadozomiborofimavidan.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16258396189368.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/eubn3448ftp2ahk0iav868ca21/28913868174.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d37dc2b6740ad23506acb1e50a48a0eb/gixazopezozezosolebi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lilijifuwobodekeb.pdfIn PDF document text
    • http://gyobel.itpublic/file/97171185825.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ek9m989kg89p9hsr5n88pl4h26/xuvadaxevoxisukepuru.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/04572923f830496693ac1fbbcc595bf3/14461166106.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/migijixogexanomotajutu.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/44814152019.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6affaf926---23741587014.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/belazuwuvatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=poquito+mas+chicken+quesadilla+caloriesPDF 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_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 17052 bytes
SHA-256: ebad24b1f43b5eddb87cb93f90223bf62a48dab695c2d8fa11da7cbc59a2b365
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 10972 bytes
SHA-256: 2e02dda8e45cc8879b2180dfa6b47c7ec34279f15df6fa874b1ed5d85327e0ee
font_02_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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