Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e8c1e2a2c28efa…

MALICIOUS

PDF

84.2 KB Created: 2021-07-02 20:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1cc436e76f1a4b6d805d093f4360924c SHA-1: 5864b66d43f3eb4808e549bdd059c59e19ed8a5b SHA-256: b9e8c1e2a2c28efa0fbe666bca06c8d604f5029bde21499e1068433a3124cb14
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=osha+general+clause PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182da80339---20410538690.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5ee6189a3b452dd2773254780fd75aba/balivedezudo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c03601a2c48---botolitikelep.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/guzimaledemeliseteg.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/bedabid.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/74446340208.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f6ccf47339f48a19c80c9b6607fe09ce/sumuforijez.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792aa2c2c83---logabupufavupesot.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/17715365182.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/15902475812.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c31431fdd---7758827364.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a20773193---bexusira.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974191c7232---93771681762.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6e139d21---34079252204.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc9a07c17---kuwakukovanuzukodimalipux.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6chj9uedpl1936k0jnlnqomb9m/61703992808.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ee13aae1d00bbe692cb3946195f2d119/87746479826.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/76902496562.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/66610fe557ebf0de08dd610c2af33429/tuleduvajebi.pdfIn PDF document text
    • http://armanetti.com/images/xezivudavisozinazeju.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0ac99fcdf3e9aa8fc74d5fd1ed4d70fc/4733365484.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/76449173867.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9493a69c930a00c758347486135058a2/pudamomozatob.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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 10324 bytes
SHA-256: 28ebffbc7138d4cf9f962bf290837164a80cf5a7cb7389f175624279b94dfd2c
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16164 bytes
SHA-256: 9ee25e8e6cb94ec55297b58e1f5cba02915bded235613893d8befebead850f66
font_02_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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