Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c15a34dfdcac5a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 04:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 920f73a032a0556ddb479e1c54506e65 SHA-1: ceb0d05faacd166848727f1a969e44ee8c284ab0 SHA-256: 04c15a34dfdcac5a21b8f0337c2c6607e08edb4744bcd8408032b9c512f9535e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains. The presence of external URIs and link farms suggests an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=how+to+turn+off+torch+on+android+phone PDF link annotation
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507895ad26---nafagusogurumu.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/61643432068.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/6bf7b4c02dcb71971ab0cd48687f1be9/lexojabajovafajomududufo.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/segejitifune.pdfIn PDF document text
    • http://bdsductri.com/upload/files/44426671738.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/76451429034.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/kimodikepetagutizeke.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/wunokoxoboxidowuxax.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/76898242601.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/xufaw.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/92906110348.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/40657196778.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/44993652741.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ab428458---gaduboroweripezepaji.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/87832600630.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/zolifuwunejirujov.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/93975362820.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d34db35e7---pirufok.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/bininudurawesa.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/xikojetemefomaneped.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/wameriposivexuragisi.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/soburugotubanonizi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gmm4ltoqpj02aovvrp8ul70ml0/45901989114.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_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 10680 bytes
SHA-256: 1c7be6e818229dd1d9e9c3b685b6daa30d60adb928ea9951df37df2958d8c7a8
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784

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