Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce36eb7c8bfe4f1…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 21:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87f04fba6c9e1eaca128ff987f84c508 SHA-1: 82fba7fb61889626974d2a2634eae05e677841af SHA-256: 4ce36eb7c8bfe4f1fb361d7caf2b91738f25c1e9f6ce154a5b722e10f7bcf227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect 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 phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://angel-conference.org/upload_fck/file/2021-8-16/20210816193418180407.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b0275f7c---fijelamolexo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3518358c.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/oe57jd7061sf4qbtpbrsr283u5/44830659022.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ahoeevq9s3s94ukdok83gnfpha/zumewopatuzafedip.pdfIn PDF document text
    • http://artospace.com/pics/file/70724524510.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/38722856233.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0a76661d1b0030284c60bed4942855cb/67670053813.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/87794915982.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607708b4975f5---49283352342.pdfIn PDF document text
    • https://mmtours.si/uploads/zuverok.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/lajoro.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/9697089305.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/614a718fa4dc5626670bdd224d5adc46/71641340073.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/33028220765.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/bogevuwezalojawe.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc9619d9b3---xogokabuxidazok.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/82593648851.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1d24bb785b6556ad93b8bca1c2d746a8/70089531315.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/24d50ba7b7b542771ea1cf719a0d2f11/98847101187.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/75781254617.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195749a98b---vakape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=transitivity+in+stylistics+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 17060 bytes
SHA-256: 85b09c4dbfda347b9a95a6a7bbd0b6f00b3baa5966ba722b0d1a0bf0c24a9d69
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 10504 bytes
SHA-256: ca27197e6d536ebced7359d67fb47f5b9657d548f32453e773015419ea320f9d
font_02_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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