Malicious PDF — malware analysis report

Static analysis result for SHA-256 1515d865e92cb960…

MALICIOUS

PDF

83.5 KB Created: 2021-07-14 02:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77f79c62cdf4d69cf1568776b8924f25 SHA-1: dfd890608a1aa6d259070fbb0bd4fb6dc733aeb5 SHA-256: 1515d865e92cb960be9884cee2d315bc62af157a1802bd51fd91e1a7aa048d92
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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=download+mp3+drake+life+is+good PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082599d1f924---41935720688.pdfIn PDF document text
    • http://93564497.com/userfiles/57164763049.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/17826986164.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a7ca7cea---42349506254.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/lezogajadevojajivaputo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0758c34b4e---kaboputiwodevuxobuvalel.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/vawik.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/26787966ea1bb260b05f2a4219c56ab3/dotujegabef.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/j0104t3u5av41peoqst4sfukdv/laxizizefetewazifekof.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/bafagimuxapupaw.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/pegirubakadugawikadivob.pdfIn PDF document text
    • https://ahha.az/userfiles/file/85128732794.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/71133087374.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/b10pc8t62m6gqjpnl5dmmb893d/woxare.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/gepomewu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217131311525575.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/60796020685.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210616151928.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/54971233294.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/18d696bde134294d8d93a667ae49ecc0/54272560081.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/c60337dc5f742501551e69449ba2a8d8/64052359012.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/389be9dafde94bcf0648a46362fee073/rusifufilubenugokubave.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/giriwodimaxenagu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDE 18984 bytes
SHA-256: 1ad17b9bfdbb6931334bbc5f8bf785877860f4b5fcad4f14da05123e64f9a9d8
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 11092 bytes
SHA-256: bf95b58fa4f32318267015e5852cdb852ef0a87ee8b952778834f28c45cdcc8d
font_02_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472

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