Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b721aaff4c79112…

MALICIOUS

PDF

90.7 KB Created: 2021-09-15 22:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a0ba4fd162e15c45c493f89bb6139f1 SHA-1: 90d25decb85f26383e0510a86e649210d95720b9 SHA-256: 9b721aaff4c7911297694276961eb53f1de811a1c98f7db19ccbcd4cccc2094e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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://philabc.ru/uplcv?utm_term=labyrinth+of+ragnarok+mod+apk PDF link annotation
    • https://chulintemple.org/CKEdit/upload/files/faguloxexiwujusexesal.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/40988606306.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/bolekujipewesituzizefes.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/3638474022.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/berano.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/098709323270d1fdadba80f8ecbf9c27/83828842456.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613adab2c9f82---34715576919.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/jaxir.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/90552295280.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/tabubejuxawipusapi.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/varidetigetetavufawo.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/48141302509.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zuwanazog.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/dovoxovok.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/96d4a6fb08b4499347e9d3559e687928/benuxojipaxaki.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/26087417736.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/91199358658.pdfIn PDF document text
    • https://okazionche.com/files/34986444322.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/vugatinapurajeweb.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306dfdb94ae---42547477704.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/68190125023.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/31888062446.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/putasijopubafoxisosodemij.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/vekodakokixobefewapumewu.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/7323119759.pdfIn PDF document text
    • http://konberdbio.com/upload/files/67780788066.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 16608 bytes
SHA-256: c7fe2d7a8c2f111e05e1a664e15a3f483ac6c6611d57e4c947a492b17e3386b1
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 21340 bytes
SHA-256: 16b7d54964cfaff262751bd8fe55b2883b0415056d64de746dd42840a21fb43e
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000141ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EF 10904 bytes
SHA-256: d4770cd06b44993a831661f69c4c689950c76294f00e4619bda328426b48662d

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