Malicious PDF — malware analysis report

Static analysis result for SHA-256 e011f1fcfa80096d…

MALICIOUS

PDF

100.3 KB Created: 2021-07-05 21:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77d63c962391a9c92f189e695941dc88 SHA-1: 03311cf2aafe5c88d8ff1f89554b91d29841d376 SHA-256: e011f1fcfa80096d8907a29809e0623f0e5e7bf74b02ffb6e46b234563fff1a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://huntic.ru/uplcv?utm_term=download+lagu+adele+rolling+in+the+deep PDF link annotation
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c5c144eff5d0f3a3e0efe71e43b4fc5f/filivegukezabuvesode.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8bc6a29da826da27c4f8ca99b15d9868/14222846716.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080a52de3c07---4855801444.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210704_124323.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/32fa693392b1f3462d34fd65a9828264/95573014676.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071f69b703e5---36308339948.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d837d6280---77622131837.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c864256476f---koluge.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8349f7b761---16762193680.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/vikezefaviziza.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/tuvipafagute.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/14200588423.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/basapafezigagis.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/mokuvaviz.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/2e49aee9eb801252fe94096d3b5fd984/16572755834.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160900649b18a6---39015365446.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/fd9c3208f4be1336dd0e66c2987d45a5/simivedi.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/kazavafogituvaro.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b2f9562e1dd1ab3bac2eaf312f24f627/95326126880.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/73344065772.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/14760279509.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2715a0b38---bodunuxotofimijasufogiziw.pdfIn PDF document text
    • http://kd-council.com/upfile/files/13732370409.pdfIn PDF document text
    • http://learningkey.org/userfiles/tosoveba.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079fa5adaebd---vemomunufowamikute.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7189b91ef0---85523632731.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/6166705335.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000144b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x144B2 21852 bytes
SHA-256: 7173a0cff510204070ec16c344895960ac42fdee219fc17f47a44a220d827512
font_00_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10688 bytes
SHA-256: e61ac018f4897edc363e4895eea5edfefe84b9e4765547e9e9af10dfa5d22ab3
font_01_sfnt_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 18072 bytes
SHA-256: 5300d7852df54c249fbd20074f95b4dde188684e664c5fa6226fa759e447550e
font_03_sfnt_off00016ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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