Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19272b623fa7fcf…

MALICIOUS

PDF

111.3 KB Created: 2021-06-12 13:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 607253c79b77241a596ed0a1b5837087 SHA-1: ceb9c338826c555b6fc677c5e7250cb917faccc1 SHA-256: e19272b623fa7fcf7d7fd07565d7caf8391c3f515853f26aaa7a726da904499b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/uplcv?utm_term=80th+birthday+wishes+in+tamil PDF link annotation
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7baefbcc3f77b7eba1f52963867b9337/98748497691.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/223f39650a555250e9b48d949d772eb7/defozojo.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/tanepajanefakezado.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/53decc1d5570494b0e0e3abc7ccc22e1/rivogisi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a2b618cc2d430eb09a50fd2c61e90343/xemukobe.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/zezudakaxapebadifamure.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/8667307862.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098b36ac7e92---xifabobunomef.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/namen.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/goziwegelesodanowof.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/410105addf68c8fba2e60d7b99a57cfa/42967614565.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912840c000---5552632224.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160904c817b084---rimax.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609492b42dfa9---7555080927.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/klftge33qljd5dmkftcm88skq2/jovulalepovegesaxojujugin.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00015d9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15D9A 22300 bytes
SHA-256: caab6154e4af0e262b0c5957eaaa738f2bcd9309b3a07fcab4345a7a777bd1f9
font_00_sfnt_off00014a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A96 5640 bytes
SHA-256: eb7e7bee83af98c961de1729d6069719a4d315f787ec35c49a832b441414e565
font_02_sfnt_off00018c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C47 10508 bytes
SHA-256: fe2268a8e827e0b5985e6a2acf29bdc1004481f5802bc816657d6a43abbf451a