Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b5bb3885faaae5…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 18:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0bbd7e854efce7dffadc8cdd34954c88 SHA-1: c3ef529b056d4b4f9bdba06d8cc57de305b025ee SHA-256: e9b5bb3885faaae5c0a47978477d796660d813bb511f43aedbab8b8b157d6d5c
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, functioning as a link farm. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely to distribute further malicious content or phish users. The document body is unreadable, but the presence of many external URIs strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://akgikorea.com/file_upload/fck_upfile/file/94346926892.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b1f83394d---zusepifosagoranesinet.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/130a0b836a1096648a8aa5cadacca4ec/44217844722.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/32361548681.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ec43d4d2---57053854486.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d12d58cabf30ba7aeeb207fc7eb156f6/bekazorinezapanudane.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173ac17c2f---2659201281.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160762b3f4b450---jinolulajiroredurupikizi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/md9in3novjnm7i3ddlkmil9mq6/96294152083.pdfIn PDF document text
    • https://ovalpolycoats.com/media/62190678989.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/nevurug.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d99558054f---41399612948.pdfIn PDF document text
    • https://jobtiara.com/files/files/vasirusojokatusebeniga.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9da6cc36de39a3070088491ab6e403cd/11240668028.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/43586830622.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a07b93dff9---83876420843.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/83498639016.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8affb4451c---28274282415.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9c9b91358---gopegesudulopipif.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/44338958876.pdfIn PDF document text
    • http://www.asslar.de/downloads/87199915503.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a433b3fb335c529eeadb3a03d1c67fa0/7762870918.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/42898296840.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/14164749861.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rvvefqvc7r2t2ch5i91tnkkvmh/1939170847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=it+is+a+good+idea+for+all+boaters+to+use+a+pre+departure+checklist+whyPDF 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_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 17232 bytes
SHA-256: 29f2e6a17a7cb392c782a4c9b3f7fd2ecaa6f661efb175199265586949b38bd5
font_01_sfnt_off000121d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139ED 11280 bytes
SHA-256: 4288ad5a6500a32dc5130c7e30c070b1939cbf688ee60dda8d280e0948334c51