Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31ff2c6cbbeb026…

MALICIOUS

PDF

131.8 KB Created: 2021-07-23 18:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d7f42b01bba1b716056221587eba705 SHA-1: 117169f5053d9365742b56a7a1531519ef7cfdbf SHA-256: c31ff2c6cbbeb026964581f85ce6c39aedfc1eda2b89019c67634c67c604521a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for 'SE_SECRET_RECOVERY_LURE', indicating it attempts to trick users into providing sensitive recovery information. The document also features numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or credential harvesting campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/20e7ad395f7c8e3dce67b6c6b052cfc6/93578011677.pdf In PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/revuvizuxepiranereguwekew.pdfIn PDF document text
    • http://holzbau-napetschnig.at/lofarelirexugulafulu.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/pogegaw.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/27849900953.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a893c4b95---kutafek.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/60553978844.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/48753203741.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/sofobepodufobefesadeg.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d356c93e---limuxalubolobu.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/63115703740.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/384022d2090fde66068b9b51862c64dc/79462874374.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c647b5f294---kavatanavumapemiretininaf.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/30495566095.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/lumedamojomimubem.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56e616da1---mudazunapovowefa.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/ribabiputaf.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/55503073339.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3fb8ee401---juvewobo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03014787a5---bewipoburaxukesezig.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b88e7d7b---94499599626.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/57814276912.pdfIn PDF document text
    • http://tai-group.com/upload/files/xagemorixuripotunuvolupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=american+megatrends+bios+update+linuxPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4A8 11180 bytes
SHA-256: 5d6f75107d1e78db4dfc3ee8e132ab47b168690758651de4d3dfe3d982423f98
font_01_sfnt_off0001be61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D673 18840 bytes
SHA-256: 8ba450b82842d82b11c47c90719bdb7f7e896d7f82ec875693722fed3683cdcc

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