Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe063153abc10e2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 00:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28c7191fed02fcb0f8cfc468f2c4b4b3 SHA-1: 644868af6cacbbeff12c859ca6026763b7218265 SHA-256: abe063153abc10e26b1576b4de62c9f07b65e67da183ea887bc90020cc29f44d
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://pre-www.bridge-college.com/uploaded/ckeditor/files/buzopazirolikiv.pdf In PDF document text
    • http://allineers.morefriendship.com/upload/files/setanuwojedoxixax.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614047aa1dd94---28713531164.pdfIn PDF document text
    • https://digireg.org/upload/22100925244.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e6f1365bff5c06550b2577570ac11ebe/rafopowogenunalawa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc5d84bbd---rupazaxizaderet.pdfIn PDF document text
    • http://skene.es/userfiles/file/17079437932.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210905153015.pdfIn PDF document text
    • http://bamor.org/userfiles/file/wufemogepilupemonavegapen.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/82727430096.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/71618488567.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/wupopomolirizuwenalerawit.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/77117d6b2116e164b2a231187f177f86/97820466504.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/wufajezedavafakabex.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/gavepubopobizis.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210907_F2FBA5447A02ADA5.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/83398683225.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d35e4ece7---94472045782.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec9227409---ribajavusixipudufe.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/45608148967.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/vipisukud.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/19714256497.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/77064364331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tool+root+all+androidPDF 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_off0000d39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 17356 bytes
SHA-256: 363267284b8fee64bbb5a13bd7dbf850437dbd6295eee54552bd4fbc2706bf7a
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 9904 bytes
SHA-256: 39ea14b973dbae92b4c1d9729125d075c634056d2f79cfba6d9c8592dc3e2c3d
font_02_sfnt_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1