Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18ac3ef71c25fd9…

MALICIOUS

PDF

155.5 KB Created: 2021-06-28 00:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfa4f6e81923519b7e6d31cb5ae9a0da SHA-1: cc50c3fce820bd28f909a1f6566c45aa5b1b8ed0 SHA-256: f18ac3ef71c25fd954742462c4f162e81f33e5b7a67b47b5c5d6b972c07def03
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which host other PDF files. This structure suggests a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/kbrpsp1cgo3enggl01978bqpu8/wuzap.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160984edc6e7b5---xivumewumisopedof.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/c6aod671hcecc9u693isvp55ou/81558349545.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jemolenudisitebu.pdf
    • https://baxsporthorses.nl/userfiles/file/88076542010.pdf
    • https://webmenuplus.com/images/file/9005506905.pdf
    • http://kiemtoanhaiphong.vn/upload/files/62064618854.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2acebc03b5841135e145e90ab62d5954/wemezukedogurivorukesej.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4df41dbce9e1fdb0194388caf6f75d11/tirinixobimifegonisopux.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ca32bcc56---64760121202.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1e035528c85ccb111faca39a3d571584/9603415145.pdf
    • http://hrt-foto.hu/_user/file/dafadovax.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f67a694afbd3ecc47e31b4c843ddefe0/sotanuwebolozu.pdf
    • https://aravlicraft.com/cmsCart//upload/file/57241179603.pdf
    • http://morethancars.nl/uploads/edytor/file/94538386306.pdf
    • https://p99.tw/pro_pic/files/sowev.pdf
    • https://viessmannboilers.ca/fck_upload/file/89010950695.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/81ec268414c5a93a01d0f210f5658b4a/pewuxaxizadobovumeri.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/oaefmtqibi14ggruq06tvbjki7/8265831164.pdf
    • https://nezrenpin.com/calisma2/files/uploads/39446907163.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081f92ac7c33---bavowaxifujugup.pdf
    • http://saiprogetti.net/userfiles/files/2690155525.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e74562f569fe371c0584a4e5493c6603/49600381847.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3511b208---50043794990.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef1ecec55---pimewedijusazajobiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=essay+on+freedom+is+a+gift+of+god
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dcb5.bin
f88e9d8505e293bc407a1688634f7c7f1b263f9c185cdc8d793e57f64f6905db
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCB5 10748 bytes
font_01_sfnt_off0001f53c.bin
d7d1897bd9be24fe19938ed77fab0b46fb3856a16b77bb436907632454c30420
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F53C 19284 bytes
font_02_sfnt_off00022806.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x22806 16792 bytes
font_03_sfnt_off00024017.bin
f60d1560c30ff7f48eba3690a93c678e10d1d4d177c7e3cb8f1c3bbed9416641
pdf-font-stream PDF embedded font (sfnt) at offset 0x24017 19212 bytes