Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4827d983b0f2d7…

MALICIOUS

PDF

96.1 KB Created: 2021-07-17 20:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d375223f7f872d1b36f9aa6dd808ab60 SHA-1: 1aebcaa958a7b6960fb6de5bacdc9b24b64bd3ff SHA-256: 7b4827d983b0f2d79cf033ec5827216f68d559bfb11c0ed064f663745cc1f658
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised WordPress upload storage, suggesting it's designed to redirect users to potentially harmful sites. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ki2jose6539hv2fgtun2a0g63/94600171192.pdf
    • http://al-bandak.com/userfiles/file/19792050362.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c676402474---xobewuxulolezuk.pdf
    • http://angelcabrera.com/FCKfiles/file/66768340356.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f8608fe3---dasatidevujirituwos.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160886e78ad539---xeretedol.pdf
    • http://marinda.ru/pics/images/file/sulodeluvisinumapukalira.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ab8ccf0e4db94cd2b78adfbf1224c379/92746248448.pdf
    • http://musiclivemarsala.com/userfiles/files/28506621125.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160882e8842977---tetakololuviropadisogut.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1835f8ee5c52976b9929cf9685efbd11/minezudatadeweb.pdf
    • http://campbellelectronics.com/uploads/zivakabadis.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/77dfe80295fab839b6d7b2dd445da9ce/71843635269.pdf
    • http://alexlunacoach.com/img/editor/file/37832634578.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/49a228cb1596301726b606f12e6dcd62/52138201759.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/cqdj8j6cvho0iu9jpsltq5khht/lezodesalolu.pdf
    • https://astdubai.co/userfiles/files/davogigubibibi.pdf
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/55268996667.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe5328db07c9335eacb8f12f5a9faf16/ribalewes.pdf
    • https://hostingalani.com/calisma2/files/uploads/78488217441.pdf
    • https://debo-fit.be/userfiles/file///74613678969.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e18bad70c---98650120350.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a6f3582b4376c6a819f8258bc2f6e608/39825181443.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea298c72b---82781708005.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=meaning+of+opposed+to
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001558e.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1558E 18328 bytes
font_00_sfnt_off0000ddd9.bin
9d74b7a1adda11175f687bc0f06fcc357b03bc89da3a2725c748f4ac04aee061
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 23356 bytes
font_01_sfnt_off0001181f.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 3464 bytes
font_02_sfnt_off0001259e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16792 bytes
font_03_sfnt_off00013db5.bin
e5895d7cb6c99c75b7a85ca0f34a683735ae8d9f7bd441fadb2e4f3d3b0d8870
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB5 10520 bytes