Malicious PDF — malware analysis report

Static analysis result for SHA-256 c627f3dff342d9fa…

MALICIOUS

PDF

97.0 KB Created: 2021-08-07 23:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf7f0fcb3d52782d719ff578d3118473 SHA-1: aea4dc621a72b7ca96eb9fe593cd692b6ef1abf7 SHA-256: c627f3dff342d9fa6ca4c772ee4c255e095105abd66311ed5b64105fb1fcefa4
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The document body is unreadable, but the heuristics and URL analysis suggest a link farm designed to direct users to potentially malicious content or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://edu-family72.ru/content/images/uploads/file/38915475051.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d972024eb---11460736171.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/tanijibipalefomuba.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bevavejakad.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/06ab2501ae642b31c94fc690e1871871/tonulozudosisesa.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/94646136337.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160da026139621---podokesowop.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094e66fc408f---bapumutere.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/tuluzutujimesaguvoti.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc4a49ecc---79546541433.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/80704669898.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ba63d2a16---firenigixaronogubaba.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160712115d7d5c---54108048240.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/kokiwakek.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2ik5vu6aepptr6rr93br3ervu0/sejigelomovakuxofenipiw.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/75106327461.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780fb8a6e6e---bunafofunopobabufon.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/9bcd3323ea3b66f1b9c4e4634cae8160/59323465117.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/sl36scbhn3afnsffai9orp4122/zedubodabajewazuw.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b35602e3a8c1f6ade434f223a4ff30d3/jubojidig.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/567af92632bfa533da7aee775b8d550b/wixafak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=power+rangers+beast+morphers+episode+1+watch+online+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 18380 bytes
SHA-256: 08753062a764c4e44476e42bdfcd6f37a939aa5775a1dcee5aa9f76ff1b33ce9
font_01_sfnt_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14348 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_03_sfnt_off000158a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A1 11348 bytes
SHA-256: 45d2ffcb4c557898945abf24c68a4e6b08cb328c7334f0dce3fc65b25fef155d

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