Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a56b7615c7ba3d…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 06:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92849ad32a117011b43d0fda79bc7486 SHA-1: 2e913a429e6df14863a9fc1a7f844f5f3032e6d1 SHA-256: b7a56b7615c7ba3d39c28dcdf2820980765a9f6ee6f2854fa39a00189a1056b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external resources that could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=coffee+nest+coorg
    • https://ascinfratech.com/clientprojects/trading/file/zaxudezavugigixi.pdf
    • http://csaladiegyteruautok.hu/userfiles/files/sukesuminodatitit.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092dd12ce738---95859010313.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9478c0ab58b5d21cd385aab9055827d7/22561955684.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bb8dbc4---97574895815.pdf
    • http://domeinbeverdonk.be/assets/files/file/20610102546.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/bajataxesoleba.pdf
    • http://nfc.soo.jp/file/punadezijufomotuzasidaw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874aaada8cb---52162117942.pdf
    • http://tfh-filter.hu/_user/file/vuvoduxofepalini.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d22fc2e32fc9fe918fd744eb6270985e/29107593142.pdf
    • https://aimara-bg.com/userfiles/file/zadilimugux.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/xalupetirosawizunurodu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d182a3a766f---66674110960.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cadb9a782---58139057312.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/0bd1969dd55606cbacd66859f63d045f/5840622407.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97e9d7a28---33952405343.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/1d40837f34ad69128995738a333b4c3d/tirikemiwutezapozafodanap.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f6c1d76f---69181589262.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea94ba9136---jidozejalidanutazobojezur.pdf
    • http://allnatureint.com/userfiles/file/gakezemelowiluv.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7eb662b3---xodinugobazade.pdf
    • http://china-engine.net/ckfinder/userfiles/files/33232215738.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/u6ljm3tq9rtoerr53d6ou8i8vl/72719005980.pdf
    • 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_off0000ed1b.bin
9ad52dff8010db20017d945ac1603b68f53cb3768d613cac29b24fa74e9ed367
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 17148 bytes
font_01_sfnt_off00011999.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 16792 bytes
font_02_sfnt_off000131b0.bin
f04a420566e766b4709e444f0beaf1dce054f41783814b50470dc2de590fadf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 10244 bytes