Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1d4a61b32295df…

MALICIOUS

PDF

92.0 KB Created: 2021-08-18 21:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6e1311099e0e3a970ccf4d9cf080d0e SHA-1: 4b62ae61e84b3e10136373826df168352a8b2a87 SHA-256: 2c1d4a61b32295df6d955a909c8c4c3d38c2805de57df0616610771d49dec749
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a lure to download further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to obtain a password for an archive, a common tactic to bypass gateway security. Embedded JavaScript streams were also detected, which could be used to facilitate the download or deobfuscate the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://exclusivelimoservice.com/ckfinder/userfiles/files/24716243576.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1610b905cee85a---35623286399.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1bd630e6ef259f9ad7ccd24e4e94ae78/63133907297.pdf
    • http://apvn.info/userfiles/file/kobekuxudis.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/88762166345.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/banefer.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e33d61062---52978622398.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/64351451512.pdf
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/xoxir.pdf
    • http://jinanxintiandi.com/userfiles/files/gatagusawi.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/temawenusomibogogavim.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/46f4f912tvfi5pr31ku1jkj6f9/netozufafativovebut.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/fixeguvevazasozudobana.pdf
    • http://www.niziointerior.pl/upload/file/23891149409.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce066cdf0c6---kawef.pdf
    • http://cedule-plachty.cz/files/file/dotatisopironazujed.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f5tkb3el4cq5irutsjt4vbra00/18872187226.pdf
    • http://www.cavice.fi/tiedostot/files/72589768115.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v46at1kb4fbg5ghdsgk37esrv3/70305993552.pdf
    • http://esistore.be/userfiles/file/dibodafutemowudexexotageb.pdf
    • http://wang023spa.com/userfiles/202107file/2021070600351370554.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/fuferavizasebuniwo.pdf
    • https://smgbid.com/ckfinder_userfiles/files/muvimixamum.pdf
    • http://s-privod.ru/userfiles/file/84898817404.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=descargar+adobe+audition+3.0+gratis+en+espa%C3%B1ol+completo+para+windows+10
    • 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_off0000e3ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 16792 bytes
font_01_sfnt_off0000fbdb.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 16092 bytes
font_02_sfnt_off0001111c.bin
34122016dbf5217b3774e69d215e54828751cbd63c746bb372586f79f87f3cc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 18424 bytes
font_03_sfnt_off000140dd.bin
7c0e03ca3b7dfa949cd4272bf2176adb6f261b75dd696ffd9c9882d0344550a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x140DD 11800 bytes