Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2268343d6f421b…

MALICIOUS

PDF

107.0 KB Created: 2021-06-29 23:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: f9cb7dc24718c4380dc406ff4f461a08 SHA-1: 3568cd9bdcbbf59812c10e4d82c8f46dc7281f88 SHA-256: 1b2268343d6f421bff7b8223aa4f69da6cd19088e2c25a10a37068a6064b051e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9698

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a34a483791ed54b7c90e3794da300634/72570592931.pdf In PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/93912999783.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/ribupisivarevozevuzovu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hg0aiksccdd1fj6r9doavvvjp7/lefugele.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5b0cc04f---41263207428.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/83310124510.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b97df5bc22598c5a1aa835d11c7be60e/wamuxurupaj.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zizefi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4d29da0e9---17406396010.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/934otpdh8ji8j4ka95jtkk17he/sivuzivodafomirimino.pdfIn PDF document text
    • https://airshow-bg.com/file/nipizina.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/dusuporu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a86137eb---93404594465.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/83103375201.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/259bd94578e5c36fdc3344ee4910fcc0/32202835739.pdfIn PDF document text
    • http://klefmarken.se/upload/file/dugojoxadigopafe.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31cd9662b---levupekefiwofulope.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/l7n9q7vpm82a7t85ps8ciph3m7/fikezukavudev.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/nisojimekomaw.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1pdbv7a2u73rbv4h57quplqov1/11538850647.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c942032e1---velafuxemamasuru.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6b2e43db---96897289363.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/homv13f6vkk08vnfqh2642cdna/sewofivugimubezolova.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083baa0d6e1f---28139732087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=parasyte+part+1+full+movie+english+dub+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010fe5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FE5 22328 bytes
SHA-256: a5bf9c8c4f18c72d13a51d93f82c0c80a077ce52a3f53b6b9030f6d3b7fd90d8
font_00_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 3132 bytes
SHA-256: 15b8f248de9bad5d3b7205d5277261ae4ac5ed150d4fd29ba6958021a2460a3b
font_02_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 20616 bytes
SHA-256: f89b4e3e64d4a571c247eac91b0942297a469ec9fec0b88fcf2f12a8582f7f22
font_03_sfnt_off00016a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001829d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1829D 11504 bytes
SHA-256: 8c6ba821fbae6a22b6954a8845130bc6fab304aa0c913a8b315a48f7b1fe184c