Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee286734bdecd16…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 11:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d21a2e7dfcc4fec408ecd95c85e49caa SHA-1: 64fe08c7b56f48ef85bc728bd22dbdbc718f9b73 SHA-256: 8ee286734bdecd161ddc95b4458826d07e714185ba3494ee0d8f77f669b10d50
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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://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_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
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 11200 bytes
SHA-256: 2a7946036c3a97300a792fd3d3a18dd013b2f14ec400371c309bb1a547875e85

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