Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c888e7a39040b4e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 16:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a17c1b7d62beb697d09de078e7dd8f0e SHA-1: 536db3a33004611cd24c76773327d8461d513a62 SHA-256: 0c888e7a39040b4e9150fbde4a9ca7cb0ff29fe3aace31b33ed11f7d773b1a71
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs further supports the idea that these links are intended to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=papermaking+process+pdf PDF link annotation
    • https://nhachoxebus.com/upload/fck/file/konipezuxo.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/34461255748.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59fcc68e3---49697159840.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/51485863130.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe97b8025a---simurigewo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612a23c734bf6---bamafefipas.pdfIn PDF document text
    • http://lblussana.it/images/file/tatupaxukap.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/42858668148.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/50048619201.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/91871ddb5eff4daeb96c05a90d01658c/rivowaviwigerunuxi.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/93106690317.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160de865495598---7704224159.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4abac499---52580827209.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d053204086---33297437905.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/42972091005.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jcpop8l4k1kemuh5tfe5ev1csk/jugujumepebasuvedeb.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/552cf7b9e2387de8810f28d8a1340457/lowijuzeparin.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607972c22876b---6609008601.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/ninilarazebevan.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/dajopidiwimalazu.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/webanakixatuwozuboses.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df8d08cec70---41374366753.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/mufuwosulela.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210826165823.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a692626627---92467394617.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/duban.pdfIn PDF document text
    • 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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 10912 bytes
SHA-256: a2da25e8e5e209b3683ae304a556e185f05cb6193cd2ae63ac86fbe0315076ca
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 18696 bytes
SHA-256: 9c07a9aaafaf8a0bcb43e94cb78c044f059fdfd99748dba9b6fe62f7baf2aa60
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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