Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2e72d1a33af428…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 11:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e1992427903927ca66c5202fe35bc42 SHA-1: 5b6682614ba7b58716c6b7f86400a3273bc9bf17 SHA-256: df2e72d1a33af4288c1f0068953dd75d62c8b96e2ceb573de9b109207ef9e92f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with known malicious PDF droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/07a24edc2615bd0e4ed6c7b60f181006/gapexopobiloz.pdf In PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/97924807762.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q0kmkomd4abm5s8t9e32i3obl2/menojunojekawonukir.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216333327064.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/vatopemimibekonanubodiw.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/besupagegufezokab.pdfIn PDF document text
    • http://usateatop.com/_upload/files/beliz.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/60902764329.pdfIn PDF document text
    • https://majubesar.info/contents//files/70954083585.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/222em5k28t2c4kjnpevagoaa6p/jidegaremutavopememu.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/74877245214.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/givijasupuxokani.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dac2be98686---wenewe.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/weluxapoteb.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/ob367adti6d467a3cie6v084ev/54112648245.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799a4d0155b---dowifulixagizepoxipomofe.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7h67163envgtfqbvpf9b36u5vk/31343860182.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/46892527005.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/72773413257.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/33618484540.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa23c6090---mufadisizevamibukemomerux.pdfIn PDF document text
    • http://boxethai38.com/upload/file/tegogere.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaa7d126f---jevefinimagomejomojepe.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a064515bc29d99d0f635d4b1feed7b05/1879218729.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/tewesusemigijagoveboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=all+blood+groups+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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 17592 bytes
SHA-256: 52c60f647cbcacb23cc970d10f877bab5664a0ed16334951f0fcf2bff8def9ea
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 10304 bytes
SHA-256: 3ddd574c87d2e55f58ba2410ff235dfec8775808e652caaad816abfb16183f1d
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1