Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32b51e78fafd4bb…

MALICIOUS

PDF

95.7 KB Created: 2021-06-26 23:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff0e3e67b1dbf1ae0d1a7b3288021987 SHA-1: 411d84c622ac21ec7c690ed0080e4e6636c2ae86 SHA-256: a32b51e78fafd4bb2af19991b98833cae8384bf8549ca0d822326d788edbe644
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f9977d052---xuvobelifasidigej.pdf
    • http://cuatudongsaigon.vn/uploads/files/86568976178.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc94177259---jemosirigaget.pdf
    • http://copingconversations.com/userfiles/file/lapojubugoxamufevev.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7c2b60d1---disekazox.pdf
    • http://gewald.ru/content/Files/wowujugizegezakeba.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/97160380618.pdf
    • http://atomleasing.ru/media/File/nepajufusajadizokurijuse.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae5565ba9---rezerexak.pdf
    • http://asupuro.com/user_data/image//file/67470672869.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/960820d162dab7406a86ab6f266b42da/vifesexareminakimifiwupub.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f010af2fc8---34823358823.pdf
    • https://digireg.nu/upload/kusodimomoronixuv.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/13280319104.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b4d409bc85fb4d0da30160e94a004f5e/12516397563.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/82984640396.pdf
    • https://drivetripper.com/userfiles2020/files/dinisulosexipodijodamir.pdf
    • https://censcakmu.org/board/file/files/61333016330.pdf
    • http://aven.su/userfiles/file/29936470143.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac2fe16d1---1573653661.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/80cj2da0vk49hpp5kgmu4ebb6o/jisaxesikezaforomasipijen.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9b2ee71f11bdcd34802300a12bfe65cb/15675817364.pdf
    • https://motiv8workout.com/up/files/jamuzej.pdf
    • https://akproauto.net/nbloom/fckuploads/file/zemubimamaderedalovon.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ae11ebe6---95068723920.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=defrayed+in+tagalog
    • 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
stream_002_off0000f14a.bin
a0b4f14f90440421e302ff391a4dcf3db0e4a89cc884397e788a3d0af5e15130
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF14A 18900 bytes
font_01_sfnt_off000110a7.bin
2f4993e2cc1bcf62cfc7b6b83c1b85bbd2e18dc831c2382f9cc5876ec6004fb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 10476 bytes
font_02_sfnt_off00012857.bin
ceef6ec1a753effe7c5b2a5adbc942a7c2a6da94b308cebf8360628b47fa3ec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 19484 bytes
font_03_sfnt_off000158e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x158E6 16792 bytes