Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c8944f37ee2338…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 18:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3945e05d8b8f2fd3e8b0c5af1e711143 SHA-1: ef116ddeeb96ae73e1aaee46ede0e89ee42729c1 SHA-256: 24c8944f37ee23383eb6c0813e9ba0a1d4b01268b79c6a34cf23e94956d6d6dc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. This suggests an attempt to manipulate search engine results or redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://dusunceokulu.net/resimler/files/84687701923.pdf In PDF document text
    • http://brmhn.com/userfiles/file/20210909054453_lkfrkn.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/xezumivavufur.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161371e6d7a45f---refegowawirokelivubozez.pdfIn PDF document text
    • http://neteyes.eu/editor_up/82624007008.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/71059299190.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/darokilobibosesonozudox.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/290748129.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/51826567659.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210904_15BD8E441CC98138.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0fbd3c18---xanikanom.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/42093777256.pdfIn PDF document text
    • https://arerp.kr/data/file///73336979893.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3f9eb3cd---gofumatuxukevatuz.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///35890179831.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/14434796889.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/vudozixose.pdfIn PDF document text
    • http://hanshintech.net/data/file/winimejotez.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/20645365653.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/milijuwilobikajepas.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/9249690041.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1bde0c0026bcf5587a110ada6e516245/kikedebowikelop.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/gikupan.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/nupesotomasexesa.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/tifanavefefunuselub.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/88853496736.pdfIn PDF document text
    • http://zzquansu.cn/d/files/22435326684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+pokecoins+do+you+get+per+hourPDF link annotation
    • 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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 18284 bytes
SHA-256: 96fa1ea415b1b3c3c5ddd6498f27bf915b75ceb047d858678335ecd10e3cce52
font_01_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 11296 bytes
SHA-256: c5bac3f0c70cb347cc059915155aeae9638cdf1adf0c9db4025785a4e2c30ace

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