Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95c8e269239b30d…

MALICIOUS

PDF

87.5 KB Created: 2021-08-04 01:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb92242dfd2ca30d7f4f0772e9d2b74d SHA-1: 94cf1bffec7f18ed73fd4c8b434dc5ae12cc425d SHA-256: e95c8e269239b30d06100e90bcd29c44674bdb0d83d495a07ef04c7efc683a7d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised websites or disposable domains, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL distribution point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://munsusa.org/userfiles/file/20210613230108.pdf In PDF document text
    • http://paulsaperstein.com/userfiles/files/gotajunam.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/vefimapepawo.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/goxukiz.pdfIn PDF document text
    • http://fygl.net/uploads/file/020553174852.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/mexugiwuki.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e8436d0fafa1777b30a8213c21ec30ff/vawusubabejezirimefulas.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/pekizadi.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/00209daf0b37b40936d645c2c9b792a1/kipimevemabufeb.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859d9df1691---94137089380.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/siduvirudekekiwuw.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/nikexewotoxijodikebudovi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0e0d49b86eb98fbd14ca4608cce18523/wifamoviwinibiluz.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/33485267281.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f56790811cf22819f9b3c766e54aafe3/dajig.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9b68f40735b6f30def1900f7b693b04f/mijurejenowazofagozi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcab73237---36648569334.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/bujoputawenuzoselemuku.pdfIn PDF document text
    • http://recrute.fr/files/files/22386661434.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/bixuzikoxitexozuvuwulow.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4ea08b78cd5c6d183b020b03c56777a0/tekidamajozofarera.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96b2a5398---sidujifod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=barbie+fashion+fairytale+full+movie+in+english+part+1PDF 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_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 18316 bytes
SHA-256: 41ae0abf5e8ca226f63ba7ec7e9d45629659a982b860aae603e6ea58b0e55a52
font_01_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 11332 bytes
SHA-256: e7b45507559aa27a21c981ef699e6a20aaca2c76ed2f366dc5bed9638af76d27
font_02_sfnt_off00013785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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