Malicious PDF — malware analysis report

Static analysis result for SHA-256 545540a74fdba610…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 11:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2a0b81bc5d444c4018c89c107a05c451 SHA-1: 6d19cbb2019f0b6ddd212c44e88891188a1993f8 SHA-256: 545540a74fdba610ef4882d57d487901de7a084905e8dd93e4141aa9f5630e71
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classifiers also flagged it as malicious. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

Heuristics 5

  • 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
  • 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 http://brianhaymore.com/images/e/file/53670824609.pdf In PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35f20f23446c457e6518712f49f52b3a/65341864210.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f85aeac1---43232579227.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/bulinumaxotopelupizewuva.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/lumanoxevasamugeralajari.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/megowapegow.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/06c3ccaaa08cdada9a64af04b9a57ae2/23837109868.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/fufanafoduwikawisole.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jfv3cvl2tj030bddb4lspjbdr2/jepapojitejorepawotaf.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/bozasukogijuziwarikifulum.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/bedatulutuxugilenuguloxe.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/86060118662.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/puxesudim.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/38780993699.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e67a74d0---17432026791.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/ropif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eacc4e8073---gosur.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/0b078da553c0f80e0556dddd8cce6dab/72163669149.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/ruzawufesivikube.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0cf5ae49d---91256468565.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2270a3807a4323a9475688c61928101a/konotobibexixasijawadidop.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d9c29002---4921682003.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eace52448d---zogilugebavunofek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=correction+of+sentences+in+english+grammar+exercises+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 18296 bytes
SHA-256: 3241c8e2fcc254dee61127c8bff2dea757f4016b4b42d546c7dd34efea875818
font_01_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1