Malicious PDF — malware analysis report

Static analysis result for SHA-256 61554ae46b4c3644…

MALICIOUS

PDF

103.1 KB Created: 2021-07-01 00:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ffce77ae59aedd555487fe6f5ae93788 SHA-1: 815e2cb2b3e5ebd74da04a2ba75f37f4ecc2075d SHA-256: 61554ae46b4c364488c4668598b32cfd14c6e5279f26bc87427b9323ab2fcb5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=pharmacology+1+book+pdf PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609185a287a2d---wepapowujoteferabelos.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/94585632560.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/26664436521.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/zisokazikukikozop.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/77560336045.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vc6a62t314doq4lpfpp4r2mdck/75093361792.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/39435550765.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/eff29b0d761ab4e2ac217cf2860763c4/6093785993.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7675af9ad---58784955964.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2ff7165e1dcb66b2b117c7a739db57c3/nemuw.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/97000370705.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///xiwonogekagurivupif.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160819d5780317---peseked.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/khquh0cn5pc1l2hnsbnm1l7ec7/nenuxutitoxizevom.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d06f0305221d3652b45b21bf4c1f2cc8/kejorekixaxibov.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/67554983205.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b89ce20505d3ab3eb13863689eea9898/64379261486.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d290d1a536---74426824953.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a6387c43a85b82ae50ec827dfc2ca187/pewewevadozizozaki.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ab9422b3---joxafezonekunewegulamif.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2ef4e15317c8bdfb16c998c2708c9db0/74745194773.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/59abcbbe97817e0591d0ff7144d358d9/sitazetegutonumabixiv.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BF 18928 bytes
SHA-256: 04f00a41fd486a1fdfa2ee4155fe4fadcd1d1b72c6c0d2d33295ad5182f214b5
font_02_sfnt_off00017681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17681 10872 bytes
SHA-256: 40ee88cc04c53dbc962060594b29549d55d3de13e8823a19762615616df4b044

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