Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84a13003c649c3a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 13:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f52bcd2cac915d022c31d10eb94079ce SHA-1: 9298a4d9a97d11e9a4b2d56dfb3e0560a2dcd474 SHA-256: a84a13003c649c3a16811730bdf74db47f06cb057963f977a52ec58294a67663
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to potentially harmful sites, possibly for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/dda1fbbc668be70b26452d4dda8753ff/supegifamapewusekoke.pdf In PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/dexumopefolod.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e6b089448cad047e15a0b42cb88d40c4/sowimotajenif.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/97125456578.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/bosolilegovolex.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/27014450223.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-3/20210603185521501431.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/tezam.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/bujovugejivozujaxonamigar.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507134837116.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/47619052942.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/weburif.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/nabemativagimexedarem.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d6353d0379c---tiwudejizodi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd317e9cf3---60313179848.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/faxabukarabeme.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/kerikugixagugo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/03bc3f92a9e69de3c637bdba6f964788/53130542591.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607288968a5e0---71107297631.pdfIn PDF document text
    • http://perksys.com/userfiles/file/gonakobiworinul.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/juroredejofodopomesaz.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/gapujejigadifinesotipo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840b9d6ae4c---39153391083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+erase+watermark+in+wordPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 17036 bytes
SHA-256: 913c99918c424248839ae0ceb6daa11b3ac606b850c3561d735be8b14ef60ddc
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 10532 bytes
SHA-256: 301ba83a5bfb4aa1cf1802ce08bfae24e38e5f49e5de49cf289fedd2dc66f409

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