Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8c532704697ede…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 10:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a4e7237d5f220e7f7491834f70a209b SHA-1: 454119631d9ea364073931bd7e1248c872ecb70f SHA-256: 7a8c532704697ede86019025cbba92f668b32da604c6cb0041818825fc89adee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites or disposable domains. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=teach+like+your+hair%27s+on+fire+pdf PDF link annotation
    • http://phukhoabacninh.com/images/files/462125043.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/neludejikes.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/33097719461.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/tikemixokave.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3904b824---1420395280.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/peseminikad.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6fa201522---soviz.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/4075319915.pdfIn PDF document text
    • http://trieuduong.com/images/Download/22410816417.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/57618301979.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109140231342471.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/melulemepoji.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210905_392E338C0CD454BE.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/fosiwabopug.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/jorunibolivoni.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/fubewuru.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/vigebetowe.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/17d52282fc52827d32dd8c659abadc43/letamabubekabab.pdfIn PDF document text
    • http://cartopack.be/Images/file/wupizilekonipigiwunapu.pdfIn PDF document text
    • https://laps.pl/userfiles/file/galeleseludijaka.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/jewevowatudujikedelolebu.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/tolasulupise.pdfIn PDF document text
    • http://abnicum.com/files/file/19528300434.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/tenarejobarorari.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/jasipiwibadod.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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 10924 bytes
SHA-256: 2d95c6cb46cd7c50480b4f8a22490e705eaa59457328827c42776acd1b87010b
font_02_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 18472 bytes
SHA-256: 213518f5ea64bfed2b44b137a7c9d64f86420c99e41cb45821b485dd0321de77

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