Malicious PDF — malware analysis report

Static analysis result for SHA-256 15aec38f27cf447d…

MALICIOUS

PDF

89.5 KB Created: 2021-08-12 01:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab1bf8bfa16cb1cf53228dea5a129e6b SHA-1: d7c787289a4c5ed94a394558b28d8b4f31d6ca8c SHA-256: 15aec38f27cf447d53f4013b60f17442c950487dd11e1b08f40653b1d42e306b
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. Heuristics reveal it functions as a link farm, pointing to numerous compromised CMS uploads and disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/nuad2h8tuem5vapoii4g5sn2b7/pofevedelakavimatoriz.pdf In PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/pu8ihfakiosjje029kga71q4bt/pavekawo.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/sexirubofuporipofuteg.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f12da3954---fegixifikakolowu.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/47739593763.pdfIn PDF document text
    • http://placc.info/up_image/65841245575.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c48d8b8dcc8---90052201884.pdfIn PDF document text
    • http://slsnn.ru/content/files/68939564873.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/fedoxas.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/46924868132.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16093c1f753b6f---51316533444.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/28bad5f8233de6b97aa686c921b7a794/24785307090.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd0707b8b3---zijigu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/jelid.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/togot.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9302f6b3---ludepid.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ed4aafafd35af92f8a67c3003613ab92/guwopozogovem.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/93952915267.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/nekunomogorosa.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f55db7306fe---74157868409.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/togukelolikozivutar.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc02ce3cd---68873428532.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5e29ae4fe2fab78d5540359e49c14be9/lavisolijolupakazezafor.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e6b8ece32---rivikis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=eric+worre+go+pro+free+pdfPDF 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_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 17144 bytes
SHA-256: a79a2c3181d5b1597aa75c541348364a311733616bda5f05591343a91ee17b68
font_01_sfnt_off00012838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 10284 bytes
SHA-256: 29ffb026cceea14cccfd06b6e374747badfb2730d974a4d789709144260d3b87
font_02_sfnt_off00013f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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