Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b330393b781e27b…

MALICIOUS

PDF

103.5 KB Created: 2021-07-04 06:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 046479a2e6a72e1e40f6ae61c80a7f9e SHA-1: e8ca3ec6be6616e738dfb380a41a0b0fc83fde37 SHA-256: 5b330393b781e27bbc9ee47c0699dfd12c4e7b7c51b22c7d83d525bbf4796aa4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/80f2b76d806a0e96056b74e4934df207/7959775014.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/44473711060.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/xebarugeruzole.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a747e176da0b3b7993c1f61ceb32b176/18400465809.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca2c877c6c---3742797681.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbeb902ca0---bakarozub.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/8efebef447c01227fcfb0845941aa75a/wexipijinelek.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/lepuwugasebikometetu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c754be516ec---musobonujipa.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/pojafuvulegemowu.pdfIn PDF document text
    • http://farmina.ru/uploads/files/lapotafe.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210620_D25521A2E3A2DB77.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a131f48ef24---kazavaxuluparaw.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/monuxapokeridavafesat.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76e022796dcecc38449016da6e2a5729/veratezanewunaluwoxalu.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/91272831309.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac94abde91---tiseludakoxatet.pdfIn PDF document text
    • http://charivne.info/images/file/jazalibazupi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aca7a174832---84972254855.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870d3a4a16f---46355134395.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/pruo2bp0k6ef2b6j6la5u2q5e6/81291706445.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/vujimu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c261158f7---52226605913.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607336bf2fc27---rujamugifulatonupujuj.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/21841171695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=automation+studio+5.7+free+download+full+version+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000113a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x113A3 26572 bytes
SHA-256: c4d3028a85e66cad0fe671623cd58a69309ffe2c0b6561019d2c807e1d682660
font_00_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14297 18316 bytes
SHA-256: bd8c2fb9e5bfa08f7ca6c6dd5d2a051a2a7ffbe8e35d91d077e8917cf907ca67
font_03_sfnt_off00017361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17361 11212 bytes
SHA-256: 4d0795e349f0dc0c30ec805cca749867449e0ab0cb0d8aafb417975e1d6bfa7c

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