Malicious PDF — malware analysis report

Static analysis result for SHA-256 366dd8d4dd832828…

MALICIOUS

PDF

100.0 KB Created: 2021-07-05 07:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7808aef517b4cad37005cdee6c9ff42 SHA-1: 4936a8ee6b84bede1492b24d348cce74116d0d14 SHA-256: 366dd8d4dd832828cd691fed8d098a0c3a3fb8d19b3fa9ce54338e723ff981c9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and points to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure itself does not contain readable content, but the associated heuristics and URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://crewmak.ru/uplcv?utm_term=were+the+druids+real PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f604512fdc---96204026983.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/11566be05f2d6cdb89bb3cca3df97cda/65207717018.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/dememezadilupapibof.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/42e468fea0b54f8481a5f402c9d9d123/wukipogonufolomolozim.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e5d90343f---sanuvutumujes.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d5ec2d8c---5376239533.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fijinuvexetomomonutekiku.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/kabuwafuwabeke.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/v7034jdc36ngtaoj87q1th9hf3/4941993036.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cc996b380---88447520046.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cbdbee87a84bd93f0cf0903b7c3157b0/50414581324.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc35661fb---88525983885.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c556972c---zatifojevuberakabinel.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8soojh0o7peiedmos47p1dqch0/baxazazurazizizekedizile.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/87e814937cf58ffb87dc79dd7918b4b4/bavobas.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bc2ffac4bbc27ba771b9d4fae9dab861/kezewazixuputovibekul.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hp28evi1g1jgsvnhr8pr4bf7m2/jelupin.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/nukegoxegibeji.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6dea9cdbbfffb74f841e9d34029853fc/99389495612.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/00mt5ton98tm1unqq1uh5k0jq4/zigijamexatuginomufun.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d6b137b9959f5ecfae711d608bc0d7fc/57094720307.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db501be1e4---jotadojekojexumitezubiled.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9999e88a59---8691296319.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/pezolimewiz.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_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 19528 bytes
SHA-256: 65cd23d0becb9621cd1f8b46b3f4d207430e3c52fb0c52c42cd5e559d500eaab
font_01_sfnt_off0001529c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529C 10212 bytes
SHA-256: e8c1beb292113f3927e2cb5fe834b1f567892fffe7c8c012e618aa813669a8b9
font_02_sfnt_off000169a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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