Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51b80aa8bee265a…

MALICIOUS

PDF

87.9 KB Created: 2021-08-11 19:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f21cf99f296cca31efc619611186a08 SHA-1: afb53eb5ccb81d901565fd8b7531ae8c6688e9b3 SHA-256: d51b80aa8bee265aeed797f1dad5e050149ca134bd6a96a699505f986bd3e542
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of numerous links to potentially compromised WordPress sites and disposable hosting points to a link farm used for distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jnepn1hga2e8uh87vh4a551ldr/26009168758.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/98598fe551c37491f1bb413a0cad9365/nesozazufaratapapuwaxit.pdf
    • http://studiotecnicodavico.eu/userfiles/files/zeriw.pdf
    • http://acevina.com/webroot/img/files/lorilujijomad.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/i69sapum730lt7qkp8kirbqkm1/viwaf.pdf
    • http://ahxxzx.com/userfiles/202105/file/ramesijak.pdf
    • https://infoenergie-loire.org/userfiles/file/lubulan.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/17479930610.pdf
    • http://ahcxdq.com/uploads/file/11233428277.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lgivu80boj5u5adb4tcb4p5fmj/vabulobexodirusip.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160adb656057c7---gesuwutubododinenefufali.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/kusefavotal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a437a822d---filelixujakalekelup.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/86260671993.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/58378321974.pdf
    • http://beveragesgs.com/userfiles/file/22249356368.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f139fad5---33839532604.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ne1d6o7huupeaa8l0pmtqgdu97/zamubigobegumixi.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/212101b914553aabd54577f56a4eda2f/28894748497.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c752c75eeea---94332776611.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7rgp9cq0mr2e2n7j6evunti73/gowuzub.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31f60e5906---9934369153.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac9be1b66---57683054905.pdf
    • http://nwatchonline.org/userfiles/file/12774676905.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+install+rlcraft+mac
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f579.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 16792 bytes
font_01_sfnt_off00010d8b.bin
c667ea0faa4c2c822adafeb04f6d8e35e5ecf3730be1654f91aab2bf0dbedef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 17176 bytes
font_02_sfnt_off00013a69.bin
d5255c9820ceaca3cbabdecd30336e4c46c0bee67c4b99db0d002cadfb88b980
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A69 10440 bytes