Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd90b98b1e0b5c2…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 21:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbb07fa1cb8c20dc04d123be5d061c9b SHA-1: 774d328115910d4e7c340d351d3839c96d5ce091 SHA-256: 8fd90b98b1e0b5c295bff9da50e9da78ed1a7865bf78ff0c3a19a5d887f78fe9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves luring users to these external sites, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=mad+libs+funny+pdf PDF link annotation
    • http://automsystem.com/UploadFile/file/20210901211640468.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/kikagususatuvosusidaxen.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/53743606915.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dazotesimun.pdfIn PDF document text
    • http://dalaichau.com/files/dosoreluxoguvoj.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/53908713385.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kmqmk00i6kl0kecnf3gu2ihb83/21462024438.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a63a9cac1---4235403273.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/vepugubigogoviga.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ff5a9093---85550944201.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jesesa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/04cfc1e6464097f1ba56ae1decf4ef60/57963797886.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210905141014.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bf2fb0dec1cda813bea260c841dadded/mosoziweneligalefoweliru.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/zofakarojitotuf.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/54617008352.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tajudawumo.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/51259256045.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40db1c5a2b---13041771834.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/jabofamuvorira.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/fimejedisidodira.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/65643215686.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5920c7b35ec81faf29d9c80a25ca2e10/xabanatej.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/pidugak.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/17924448417.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/75192136231.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_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 17672 bytes
SHA-256: 5336932d599ee333d269a4f34ee6825ce129d2387aaf39186405f06d89bd2a47
font_01_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 10388 bytes
SHA-256: 5433cd4d94956b0eeca91e933d86e39a8c39a798b63b45111204ae67ecf66d0e

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