Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a4fd30c06ea5bb…

MALICIOUS

PDF

76.5 KB Created: 2021-06-28 22:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11ae211828b93b954e8cd93cd241bac4 SHA-1: a9e6e94d0e035bb1487c3dd0e4d050b265985a85 SHA-256: c7a4fd30c06ea5bbdee75c5410b01bb8c69a68defad816b8855abfd76519cfc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, many hosted on compromised WordPress sites or disposable domains, suggest a phishing or malware distribution campaign. The PDF structure itself appears to be a link farm designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=ted+reed+syncopation+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a944e006a81---29467108727.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/79526661447.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/84546786186.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/90872399103.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/wesuvivozulavijegofoz.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vizefesifojivoxaruw.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/muxopin.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a999e755a---kusinozabup.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/fozotomuguxukalofadigabom.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160834961a1443---24291018250.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/17512720594.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/204108678cd3fa7808d52f5847726196/11794616331.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3eaf01209---sulujetapimiwativanovuxu.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/rajagosegepomuk.pdfIn PDF document text
    • https://artenika.pl/fck/file/sodosor.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/retodarokexinupijujakebon.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/99cdafdff344a9fc4c61cb85e1ba1bd9/xigujakere.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/ketebuwulesiwoj.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/41728566465.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb9eb765a2---36583892510.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/81347912494.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/dejarutozonuvebanibaga.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077514e3f501---gebid.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe7733856---88451172321.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_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 16808 bytes
SHA-256: 6d7f187bd5102f6a9c62f1202f5173ba2d1591a77a53115c33e1f8b9a676952e
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 10644 bytes
SHA-256: 76193e9036e8c97ad91d4fe2cc2aae825a5fa98fb29dfa4750a5b482c04a9a28

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