Malicious PDF — malware analysis report

Static analysis result for SHA-256 111bf0c484e732a7…

MALICIOUS

PDF

133.7 KB Created: 2021-07-23 18:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90d35e593d329e63bf97c86437eae673 SHA-1: 5fdf147701448632382d17222d4ed6c1a53bca37 SHA-256: 111bf0c484e732a7a3b7e81d6e70bbe69577da6b717a019dae38e0f634d5fc5e
156 Risk Score

Malware Insights

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

This PDF document exhibits malicious behavior by acting as a link farm, directing users to various compromised websites. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary intent is to trick users into revealing sensitive recovery secrets or private keys. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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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