Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa28a6c13872e1c4…

MALICIOUS

PDF

72.9 KB Created: 2021-09-06 04:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 509c6d13679e59c96fa87bdbfe30362a SHA-1: 5aa1a467c6b6eb975d69574cad438040b81217e1 SHA-256: aa28a6c13872e1c41e1f97633475d3faac3c4b2601658540f78283ffa396cb75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of external URIs and the nature of the links suggest a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=wampler+tumnus+manual PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5b8b40f7906e266949abf156df277144/35649666497.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b4486affd9c0220f0bb8bdb663ff18bc/pizaxufisodozux.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e9b4b8440---jesevidox.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/72472757214.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/74299167241.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/16852213721.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bebf271f1---polarejuk.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/10ad038c8d46984c08e649ced92e4f02/10394638406.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/24145947611.pdfIn PDF document text
    • http://newo.ru/files/files/63161859821.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d5c200b5736dbfe7e7a4a42d726f8918/10001446893.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14cc2a374---48361199111.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/74998338858.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/gomovokikolokeg.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/kixatokokozaso.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607beca6d78dc---neliriw.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d8e7e5b2f422b585d28fda87bfd28950/dolikemulufixovalulabu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e70177b---zesolelidema.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/vitorunomij.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/romasu.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/radonelutagoxitikobu.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/gatokabuzadimegexixaturu.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/61999155046.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/46055762006.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bemunufuju.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_off0000bbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFA 16880 bytes
SHA-256: 4276c7003a854f02a0639d1a2d8819c0139ce051b9d7418fe94e0a752c256457
font_01_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 10292 bytes
SHA-256: 6be2ee99f690cfcb1088a09e989aacbe325ab6da142e7f177e0cae65c9d8b433
font_02_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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