Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a1c128dfce6c0f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 04:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 828671d40f805f68f36ced4bb0095d54 SHA-1: a434bdbd0e420d1cf308b924f966b908a15faf28 SHA-256: 16a1c128dfce6c0ff37b1c884dc9c737598fdaf6888633b2fb8b36f479f086de
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to external content. No scripts were extracted, but the structure and heuristics point to a lure or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://morpheus-architects.com/file_media/file_image/file/93458217783.pdf In PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/5969515078.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/kowaxobu.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/35723574060.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k8qmrch534efdbhpc64jba6ib6/67295310615.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/kekopobodike.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/vazuvipe.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/kodigotevifuwakererujove.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/fanewepetupufiwafufitaw.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210911182515.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18c8977d6---84841922938.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210902213102_si3uz9.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/62750984492.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/xazobepomegafimewil.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/lifiduvej.pdfIn PDF document text
    • https://zzhqhi.com/d/files/782345976.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161367694b3d58---buzubazadepazak.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/sikewowati.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f1123bedb52d0051abed1aa3dae0f489/xerugiwox.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/90201079988.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/73024327881.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/nixuwetinefimiwibume.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/5564083443.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/dajet.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/24766165058.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21fdbd05b---fujegepefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=boruto+english+dub+watch+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 18256 bytes
SHA-256: 1b5cf5701ea903339e004b83d78b113c398401a715dba134a15f7c3146c47d26
font_02_sfnt_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 11136 bytes
SHA-256: 4bd04a796b317bcb626798a7a659ee971719e00b1cc75b9821ce4b7349a65c34

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