Malicious PDF — malware analysis report

Static analysis result for SHA-256 530f8bb6e7df61e2…

MALICIOUS

PDF

120.3 KB Created: 2021-07-07 11:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f87933648a9bd2224fc41949c24aa92 SHA-1: 9bd2a912b559c4cdc64d010c290a83ea8c775269 SHA-256: 530f8bb6e7df61e27a97e3af193a01333f973d71363b878b1dd0abc8fa40599f
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing browser extensions or updates. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://studioaba.net/userfiles/files/95798713612.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07219d69f---39801311724.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/522rb5vk5l81e8acpljettd9fu/tewopiniwisixupukuma.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3b9bd525e6cb2dbe309ce8f67e18d627/23752833002.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/xadelapavifakus.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ba17cea3---lapumimix.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30cf557f2---buziponedemi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f39d719b7---xewumuxawaxenevotugumek.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1102ff3c79e4bc6dfcac103193bc7f19/pebexujuparajetum.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/nizan.pdfIn PDF document text
    • https://incasur.org/temp//files/4927700934.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9ef1d2a3---sarurelonezalelejew.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/10996284297.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718680ce588---fovavojifejobosirat.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098340c96696---22612169880.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/63363833257.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fabd9b99---totokebof.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942e5f7587a---13367262310.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/jewut.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3773099e---mukuxufom.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7e2c3874e3442fec9ef6b4e40e1c21a5/toloribifaveletafegix.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/40ougu4nntdoqtsmv1f125ipoo/zepoluxebokosusosubufi.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e36583727fe8cd8713859bd4440c0908/dezituwanugasenaweponawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+wolf+chinese+drama+ep+25+eng+subPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014cf4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14CF4 20532 bytes
SHA-256: d5398537ca5d9b6dc2a5cbbec61d65db4ba6aef87db01ebb820ea45fa3922f15
font_00_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 9716 bytes
SHA-256: 75592f07b564662cb234939744e6d57cdabecd2feb0ccee34246f09b425c8463
font_02_sfnt_off00016f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F61 11512 bytes
SHA-256: c95bf40d751c494ec01293d7a98eac9a3bcb2d411ed5c2d79897f8f26c18d50c
font_03_sfnt_off00018a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A26 18496 bytes
SHA-256: 4388c1459a26bc853d6c19905451467051017a0ae07da323973b66acbaffa28f
font_04_sfnt_off0001bae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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