Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3892aa35a2971d0…

MALICIOUS

PDF

84.2 KB Created: 2021-07-06 05:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26d592177d882911c969e933bf0cacbb SHA-1: bb6fb323d2f05e4908ac1a0de99520f5be3aad3f SHA-256: a3892aa35a2971d0f08a284f84bbfef30cf523e81ec3ab74e44e911f772840fb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade gateway scanning. The embedded JavaScript and link farm suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://secolink.sk/userfiles/file/85122491080.pdf
    • https://tenfci.org/userfiles/file/41128602252.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff2183eaa---kusagitovokuvegetagutupa.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609dab5cd15fc---viludugurikurujitusejamo.pdf
    • http://evevoyance.fr/adh/.-/file/tujepurutegeriza.pdf
    • https://okud-istra.hr/userfiles/file/30120726566.pdf
    • https://realschoolspirit.net/scauserfiles/files/60039916664.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c399b257a45---megajixudezufoxofaluf.pdf
    • http://woorymart.com/userData/board/file/57734068223.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f094a3c02e---nozudapu.pdf
    • http://northcity.rs/slike/files/guzupubofugisew.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/57478704061.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/poretagivesutefamomo.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e3938df42e85d676abc367fc8f2f859d/livopomegab.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a1618a76a---50265322640.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/32ed3e5351f045da793503494cf0afb8/minalusof.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b00511b9b---sinabekaxoju.pdf
    • https://tortugafilms.ca/adminfiles/file/goweralenup.pdf
    • http://appletechsolutions.com/userfiles/file/bumopadokiren.pdf
    • http://m3hotels.com/userfiles/file/kusuje.pdf
    • http://gillsandgeckos.com/userfiles/file/61387033210.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+encryption+from+pdf+on+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_off0000e478.bin
a4babb04d4ac088566ef026ce93f0c9eb620c11b3bf8753e7e9603ee6cbdb89c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 17640 bytes
font_01_sfnt_off00011297.bin
78b445210d88b308ed11ab824ac0f384ec01dd0ef92fe1c04d492274116fbc93
pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 10824 bytes
font_02_sfnt_off00012b97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 16792 bytes