Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d882e04a3e6bb33…

MALICIOUS

PDF

104.3 KB Created: 2021-09-04 07:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f2cbf8b86cdec721565207647d88e1d SHA-1: c2ccc3b8017a7bf750cf2bf0c72cd8daa5ab189c SHA-256: 5d882e04a3e6bb338e5332d29a7bca69e9b2b4882459d91f116c356f09aa14c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to potentially compromised websites. The presence of numerous external URIs, including those on disposable hosting and compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=environmental+impacts+of+uranium+mining+pdf PDF link annotation
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasikitanozag.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7728644023.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160747aae255e4---xogojezuboz.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/61602000011.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/32830344403.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7f0115e1631bce2923308f65c05a23f5/detevepevaregi.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/wujijajetuvatefabafe.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6cd97df7e---75940004514.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gbp69s3u396mf4e196507hmvg0/23664510798.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/91066208104.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/lediximodovupavemaki.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b3911f2db468cc15f5407ee596cd4e9d/pivugil.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/badebi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3sg8md4vkj3onnki1c2fu2n225/13909626300.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3e4911b7---gafekupajalatazabapera.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/56828046171.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad666885ba8---sutem.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/mugufexubowitimavelobefob.pdfIn PDF document text
    • https://mbbs.hr/files/ginikuzabikulakarewodewuf.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/33998321145.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/papavefawewuwi.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/41752686186.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/q19kjc28f0b1jl892i5m1jg4jb/riterixejugizom.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608994cb9fc80---30180086178.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_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 11112 bytes
SHA-256: 6867f55df15d13694b4436112480d62a0f2cffa43f4277523daaa55659564903
font_01_sfnt_off00014b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16380 18228 bytes
SHA-256: 8b9a9641509a53a5785ccafb8d72e54a46bd20382813090053581b9bda8d9fa9

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