Malicious PDF — malware analysis report

Static analysis result for SHA-256 940111b3b23b9003…

MALICIOUS

PDF

87.2 KB Created: 2021-09-09 01:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 260ffecfc0a66d6fb54c2c410e614c38 SHA-1: ba9ebc753acaa7b24ce9ed9539cdddefb00eccc9 SHA-256: 940111b3b23b900375b72a3ad91cea616ec4ce511a197ba4039ee531e1ce6d56
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains multiple embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious sites. The heuristic 'SE_MFA_LURE' indicates the document likely attempts to harvest credentials or abuse multi-factor authentication, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://coretry.ru/uplcv?utm_term=unlimited+robux+no+human+verification PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/893f32aa2791f0ec468962a36c592a1f/xugexegolerujuj.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/74507317004.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/mepimu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161326b158d640---5071503457.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/gojilagorevesimababes.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/zomopedufa.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/65904590314.pdfIn PDF document text
    • http://abriganature.centralcms.cloud/galeria/files/mozikofupusutome.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/8973814380.pdfIn PDF document text
    • https://austarpharma.com/upload/files/pukefumixawekulolowab.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/dapawanorudama.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/45344647594.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/tolexenezazesevikerepo.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/10083923181.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161387fb8380a9---35368489838.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ee5972bd6edf0b7dd2bc4a37c1f572bb/1858376409.pdfIn PDF document text
    • https://proxus.nl/file/74457696254.pdfIn PDF document text
    • https://akvaguru.hu/user/file/17150101253.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sigalatoxel.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/41914792743.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/sebizenapobepusejigidokiz.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/40355805281.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/68452718796.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/44527953328.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/3747506896.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/pomot.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_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 18264 bytes
SHA-256: 64ca28315ddab8d3e3da23a0afab97de72aa45e4a98fcecd45ac6cbac9bcca3a
font_01_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 10988 bytes
SHA-256: 675ea81715dd0627b5e23cd858decda1a72888609834ade733f217358ae496a7
font_02_sfnt_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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