Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3e779d477fc2fa…

MALICIOUS

PDF

96.1 KB Created: 2021-09-21 02:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5099a4624d70c207b1517a27f2d83d4 SHA-1: 03f23f0a2d745661333110bfd1f1dde38218553f SHA-256: 4c3e779d477fc2fa7db8deb7aa3515c825d9a090097f3581f9756f7a8b88350c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple unknown or potentially compromised websites. The presence of numerous URLs, many hosted on disposable domains or compromised CMS upload storage, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://malir-naterac.info/UserFiles/File/zinusilekudewilemi.pdf In PDF document text
    • http://fanta-life.com/userfiles/file/dowebovifarifuwudepofum.pdfIn PDF document text
    • http://mobiliteit.nu/files/diziveli.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/32373983290.pdfIn PDF document text
    • http://htwy.com/upload/file/tavutu.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/selirapizewajobem.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/sogasi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5mtt5e5g4kmtne97v1556rqf27/14233373800.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/simumos.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/48581718122.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/xivefixinomemopapus.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/vinenegenuvi.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/38062294597.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/silutu.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/weguwupelewopexusug.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/nozawe.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210904230648_1844872301.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614594c7a6b6d---22525708490.pdfIn PDF document text
    • http://rooptex.com/uploads/12746247307.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/rorigujupudeg.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pabuwixejafowubivugudawi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161315e8867c11---neboxuketapetaxu.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/10620547523.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/595dc0770769f100236d4e368904e7bf/51329066586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=instagram+stories+download+ruPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 10728 bytes
SHA-256: ceffa244ffbabd033b0c21fef919d72978042644b9a437b71e262cacef69c655
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 27764 bytes
SHA-256: 0d48f6daaf367df0ceb1c4ee44eec01bc9dde569bf44b0aa30f5b6e0ff45cd32
font_02_sfnt_off000143ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BA 16388 bytes
SHA-256: 0b7b137544ac9deccae084c668057a3f982b7ebcd075391c6a037a6c895015b5
font_03_sfnt_off00015a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.