Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a727f90d57c77f2…

MALICIOUS

PDF

92.1 KB Created: 2021-08-05 18:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 126f8a254e48a23b2a6c217e545ec22a SHA-1: 60984038b09cbfb2e4add968cae215f91cd55b93 SHA-256: 0a727f90d57c77f29b3f54f4898a87bb2a310fe9991d08f25823889e52b37cf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/33038620943.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfdc77ede---99217697513.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2559c690---fupilikaxugubazevo.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/pedirawosusirumowimuzol.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/geveda.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c906bb53---91321140558.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bde90e759d5---51282603081.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/71571742184.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/1cs4bu2at1fapmpkmgks20ktch/78635025833.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a5cd0bc047f8904f00dbb59e481763e2/dazowa.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/38501987793.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210803_184849.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69e7343884---tederimovoz.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdda34a11b---35104675707.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/09583d7fdc5f98d6a8bda0f270513da8/69543614009.pdfIn PDF document text
    • https://giustofiori.it/file/wofudelabesijo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160720c42b0747---31183316049.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728dfddd780---nozorafufosubowozobotawig.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf1ab3beb---siwekojomu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1c59b50bb71a028889d386cb1051908f/nejibixanakefan.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fufasodoj.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/66289071637.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162667222966.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210723010507.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cfc4dc29c1ef60361404cab3d513b72f/lemuredubuno.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/80976472044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=simplifying+radical+expressions+color+worksheet+answer+keyPDF 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_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 11536 bytes
SHA-256: b9fd4582ad33a29d2c052427b8580f3cf1fca2d6db46d75f58d38670b03e2773
font_02_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 18816 bytes
SHA-256: 31b06b2c0a19721f5193605d7fc6d4c4a532c535bca97d615dbf579e0316e66c